diff --git a/package-lock.json b/package-lock.json
index 6363d4d..df139e6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "license": "MIT",
       "dependencies": {
         "@grpc/proto-loader": "^0.6.0",
+        "async-mutex": "^0.3.1",
         "bunyan": "^1.8.15",
         "grpc-uds": "^0.1.6",
         "handlebars": "^4.7.7",
@@ -182,9 +183,9 @@
       }
     },
     "node_modules/@grpc/proto-loader": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/@grpc/proto-loader/-/proto-loader-0.6.2.tgz",
-      "integrity": "sha512-q2Qle60Ht2OQBCp9S5hv1JbI4uBBq6/mqSevFNK3ZEgRDBCAkWqZPUhD/K9gXOHrHKluliHiVq2L9sw1mVyAIg==",
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/@grpc/proto-loader/-/proto-loader-0.6.3.tgz",
+      "integrity": "sha512-AtMWwb7kY8DdtwIQh2hC4YFM1MzZ22lMA+gjbnCYDgICt14vX2tCa59bDrEjFyOI4LvORjpvT/UhHUdKvsX8og==",
       "dependencies": {
         "@types/long": "^4.0.1",
         "lodash.camelcase": "^4.3.0",
@@ -391,6 +392,14 @@
       "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
       "integrity": "sha512-TR2mEZFVOj2pLStYxLht7TyfuRzaydfpxr3k9RpHIzMgw7A64dzsdqCxH1WJyQdoe8T10nDXd9wnEigmiuHIZw=="
     },
+    "node_modules/async-mutex": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/async-mutex/-/async-mutex-0.3.1.tgz",
+      "integrity": "sha512-vRfQwcqBnJTLzVQo72Sf7KIUbcSUP5hNchx6udI1U6LuPQpfePgdjJzlCe76yFZ8pxlLjn9lwcl/Ya0TSOv0Tw==",
+      "dependencies": {
+        "tslib": "^2.1.0"
+      }
+    },
     "node_modules/asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -412,8 +421,7 @@
     "node_modules/balanced-match": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
-      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
-      "devOptional": true
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="
     },
     "node_modules/bcrypt-pbkdf": {
       "version": "1.0.2",
@@ -427,7 +435,6 @@
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "devOptional": true,
       "dependencies": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -517,6 +524,14 @@
         "wrap-ansi": "^7.0.0"
       }
     },
+    "node_modules/code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/color": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/color/-/color-3.0.0.tgz",
@@ -603,8 +618,7 @@
     "node_modules/concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "devOptional": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
     },
     "node_modules/core-util-is": {
       "version": "1.0.2",
@@ -1083,8 +1097,7 @@
     "node_modules/fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
-      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
-      "dev": true
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
     "node_modules/functional-red-black-tree": {
       "version": "1.0.1",
@@ -1112,7 +1125,6 @@
       "version": "7.1.7",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.7.tgz",
       "integrity": "sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==",
-      "dev": true,
       "dependencies": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
@@ -1886,7 +1898,6 @@
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
       "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
-      "devOptional": true,
       "dependencies": {
         "once": "^1.3.0",
         "wrappy": "1"
@@ -2133,7 +2144,6 @@
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
       "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
-      "devOptional": true,
       "dependencies": {
         "brace-expansion": "^1.1.7"
       },
@@ -2239,6 +2249,14 @@
       "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.2.tgz",
       "integrity": "sha512-Yd3UES5mWCSqR+qNT93S3UoYUkqAZ9lLg8a7g9rimsWmYGK8cVToA4/sF3RrshdyV3sAGMXVUmpMYOw+dLpOuw=="
     },
+    "node_modules/number-is-nan": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
+      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/oauth-sign": {
       "version": "0.9.0",
       "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.9.0.tgz",
@@ -2251,7 +2269,6 @@
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
-      "devOptional": true,
       "dependencies": {
         "wrappy": "1"
       }
@@ -2313,7 +2330,6 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
       "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
-      "devOptional": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -2783,6 +2799,11 @@
       "resolved": "https://registry.npmjs.org/triple-beam/-/triple-beam-1.3.0.tgz",
       "integrity": "sha512-XrHUvV5HpdLmIj4uVMxHggLbFSZYIn7HEWsqePZcI50pco+MPqJ50wMGY794X7AOOhxOBAjbkqfAbEe/QMp2Lw=="
     },
+    "node_modules/tslib": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.3.0.tgz",
+      "integrity": "sha512-N82ooyxVNm6h1riLCoyS9e3fuJ3AMG2zIZs2Gd1ATcSFjSA23Q0fzjjZeh0jbJvWVDZ0cJT8yaNNaaXHzueNjg=="
+    },
     "node_modules/tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -2992,8 +3013,7 @@
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "devOptional": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "node_modules/y18n": {
       "version": "5.0.8",
@@ -3168,9 +3188,9 @@
       }
     },
     "@grpc/proto-loader": {
-      "version": "0.6.2",
-      "resolved": "https://registry.npmjs.org/@grpc/proto-loader/-/proto-loader-0.6.2.tgz",
-      "integrity": "sha512-q2Qle60Ht2OQBCp9S5hv1JbI4uBBq6/mqSevFNK3ZEgRDBCAkWqZPUhD/K9gXOHrHKluliHiVq2L9sw1mVyAIg==",
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/@grpc/proto-loader/-/proto-loader-0.6.3.tgz",
+      "integrity": "sha512-AtMWwb7kY8DdtwIQh2hC4YFM1MzZ22lMA+gjbnCYDgICt14vX2tCa59bDrEjFyOI4LvORjpvT/UhHUdKvsX8og==",
       "requires": {
         "@types/long": "^4.0.1",
         "lodash.camelcase": "^4.3.0",
@@ -3340,6 +3360,14 @@
       "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
       "integrity": "sha512-TR2mEZFVOj2pLStYxLht7TyfuRzaydfpxr3k9RpHIzMgw7A64dzsdqCxH1WJyQdoe8T10nDXd9wnEigmiuHIZw=="
     },
+    "async-mutex": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/async-mutex/-/async-mutex-0.3.1.tgz",
+      "integrity": "sha512-vRfQwcqBnJTLzVQo72Sf7KIUbcSUP5hNchx6udI1U6LuPQpfePgdjJzlCe76yFZ8pxlLjn9lwcl/Ya0TSOv0Tw==",
+      "requires": {
+        "tslib": "^2.1.0"
+      }
+    },
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -3358,8 +3386,7 @@
     "balanced-match": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
-      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
-      "devOptional": true
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="
     },
     "bcrypt-pbkdf": {
       "version": "1.0.2",
@@ -3373,7 +3400,6 @@
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "devOptional": true,
       "requires": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -3441,6 +3467,10 @@
         "wrap-ansi": "^7.0.0"
       }
     },
+    "code-point-at": {
+      "version": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
+    },
     "color": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/color/-/color-3.0.0.tgz",
@@ -3517,8 +3547,7 @@
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "devOptional": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
     },
     "core-util-is": {
       "version": "1.0.2",
@@ -3891,8 +3920,7 @@
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
-      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
-      "dev": true
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
     "functional-red-black-tree": {
       "version": "1.0.1",
@@ -3917,7 +3945,6 @@
       "version": "7.1.7",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.7.tgz",
       "integrity": "sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==",
-      "dev": true,
       "requires": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
@@ -4481,7 +4508,6 @@
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
       "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
-      "devOptional": true,
       "requires": {
         "once": "^1.3.0",
         "wrappy": "1"
@@ -4692,7 +4718,6 @@
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
       "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
-      "devOptional": true,
       "requires": {
         "brace-expansion": "^1.1.7"
       }
@@ -4779,6 +4804,10 @@
       "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.2.tgz",
       "integrity": "sha512-Yd3UES5mWCSqR+qNT93S3UoYUkqAZ9lLg8a7g9rimsWmYGK8cVToA4/sF3RrshdyV3sAGMXVUmpMYOw+dLpOuw=="
     },
+    "number-is-nan": {
+      "version": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
+      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
+    },
     "oauth-sign": {
       "version": "0.9.0",
       "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.9.0.tgz",
@@ -4788,7 +4817,6 @@
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
-      "devOptional": true,
       "requires": {
         "wrappy": "1"
       }
@@ -4840,8 +4868,7 @@
     "path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
-      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
-      "devOptional": true
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
     },
     "path-key": {
       "version": "3.1.1",
@@ -5183,6 +5210,11 @@
       "resolved": "https://registry.npmjs.org/triple-beam/-/triple-beam-1.3.0.tgz",
       "integrity": "sha512-XrHUvV5HpdLmIj4uVMxHggLbFSZYIn7HEWsqePZcI50pco+MPqJ50wMGY794X7AOOhxOBAjbkqfAbEe/QMp2Lw=="
     },
+    "tslib": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.3.0.tgz",
+      "integrity": "sha512-N82ooyxVNm6h1riLCoyS9e3fuJ3AMG2zIZs2Gd1ATcSFjSA23Q0fzjjZeh0jbJvWVDZ0cJT8yaNNaaXHzueNjg=="
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -5343,8 +5375,7 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "devOptional": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "y18n": {
       "version": "5.0.8",
diff --git a/package.json b/package.json
index b37457b..0027148 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
   },
   "dependencies": {
     "@grpc/proto-loader": "^0.6.0",
+    "async-mutex": "^0.3.1",
     "bunyan": "^1.8.15",
     "grpc-uds": "^0.1.6",
     "handlebars": "^4.7.7",
diff --git a/src/driver/controller-synology/http/index.js b/src/driver/controller-synology/http/index.js
index 9a2d306..fe8895a 100644
--- a/src/driver/controller-synology/http/index.js
+++ b/src/driver/controller-synology/http/index.js
@@ -1,4 +1,5 @@
 const request = require("request");
+const Mutex = require("async-mutex").Mutex;
 
 const USER_AGENT = "democratic-csi";
 
@@ -6,11 +7,14 @@ class SynologyHttpClient {
   constructor(options = {}) {
     this.options = JSON.parse(JSON.stringify(options));
     this.logger = console;
+    this.doLoginMutex = new Mutex();
 
-    setInterval(() => {
-      console.log("WIPING OUT SYNOLOGY SID");
-      this.sid = null;
-    }, 60 * 1000);
+    if (false) {
+      setInterval(() => {
+        console.log("WIPING OUT SYNOLOGY SID");
+        this.sid = null;
+      }, 5 * 1000);
+    }
   }
 
   async login() {
@@ -25,11 +29,11 @@ class SynologyHttpClient {
         format: "sid",
       };
 
-      this.authenticating = true;
       let response = await this.do_request("GET", "auth.cgi", data);
       this.sid = response.body.data.sid;
-      this.authenticating = false;
     }
+
+    return this.sid;
   }
 
   log_response(error, response, body, options) {
@@ -44,13 +48,17 @@ class SynologyHttpClient {
 
   async do_request(method, path, data = {}) {
     const client = this;
-    if (!this.authenticating) {
-      await this.login();
+    const isAuth = data.api == "SYNO.API.Auth" && data.method == "login";
+    let sid;
+    if (!isAuth) {
+      sid = await this.doLoginMutex.runExclusive(async () => {
+        return await this.login();
+      });
     }
 
     return new Promise((resolve, reject) => {
       if (data.api != "SYNO.API.Auth") {
-        data._sid = this.sid;
+        data._sid = sid;
       }
 
       const options = {
@@ -88,6 +96,10 @@ class SynologyHttpClient {
         }
 
         if (response.body.success === false) {
+          // remove invalid sid
+          if (response.body.error.code == 119 && sid == client.sid) {
+            client.sid = null;
+          }
           reject(response);
         }