diff --git a/src/models/StratumV1Client.ts b/src/models/StratumV1Client.ts
index a17deee..cece0e8 100644
--- a/src/models/StratumV1Client.ts
+++ b/src/models/StratumV1Client.ts
@@ -39,11 +39,13 @@ export class StratumV1Client extends EasyUnsubscribe {
     private statistics: StratumV1ClientStatistics;
     private stratumInitialized = false;
     private usedSuggestedDifficulty = false;
-    private sessionDifficulty: number = 32768;
+    private sessionDifficulty: number = 16384;
     private entity: ClientEntity;
 
     public extraNonceAndSessionId: string;
 
+    public sessionStart: Date;
+
     constructor(
         public readonly promiseSocket: PromiseSocket<Socket>,
         private readonly stratumV1JobsService: StratumV1JobsService,
@@ -56,6 +58,8 @@ export class StratumV1Client extends EasyUnsubscribe {
     ) {
         super();
 
+        this.sessionStart = new Date();
+
         this.statistics = new StratumV1ClientStatistics(this.clientStatisticsService);
         this.extraNonceAndSessionId = this.getRandomHexString();
 
@@ -277,11 +281,27 @@ export class StratumV1Client extends EasyUnsubscribe {
                 await this.sendNewMiningJob(jobTemplate);
 
                 await this.checkDifficulty();
+
+                await this.watchdog();
             })
 
         }
     }
 
+    private async watchdog() {
+        let time = await this.statistics.getLastSubmissionTime();
+        if (time == null) {
+            time = this.sessionStart;
+        }
+        const now = Date.now();
+        const diffSeconds = (now - time.getTime()) / 1000;
+        // two minutes
+        if (diffSeconds > 120) {
+            console.log('Watchdog ending session');
+            this.promiseSocket.end();
+        }
+    }
+
     private async sendNewMiningJob(jobTemplate: IJobTemplate) {
 
         const hashRate = await this.clientStatisticsService.getHashRateForSession(this.clientAuthorization.address, this.clientAuthorization.worker, this.extraNonceAndSessionId);
diff --git a/src/models/StratumV1ClientStatistics.ts b/src/models/StratumV1ClientStatistics.ts
index 693f74a..cab1a24 100644
--- a/src/models/StratumV1ClientStatistics.ts
+++ b/src/models/StratumV1ClientStatistics.ts
@@ -33,7 +33,9 @@ export class StratumV1ClientStatistics {
         });
 
     }
-
+    public getLastSubmissionTime(): Date | null {
+        return this.submissionCache[0]?.time;
+    }
     public getSuggestedDifficulty(clientDifficulty: number) {
 
         // miner hasn't submitted shares in one minute