diff --git a/src/impulsegenerator.js b/src/impulsegenerator.js
index 1b09d0d..e6512d2 100644
--- a/src/impulsegenerator.js
+++ b/src/impulsegenerator.js
@@ -8,13 +8,17 @@ class ImpulseGenerator extends EventEmitter {
     }
 
     start(timers) {
+        if (this.timersState) {
+            this.stop();
+        }
+
         this.timers = [];
-        timers.forEach(({ timerName, sampling }) => {
-            const timer = setInterval(() => {
-                this.emit(timerName);
-            }, sampling);
-            this.timers.push(timer);
-        });
+        for (const timer of timers) {
+            const newTimer = setInterval(() => {
+                this.emit(timer.name);
+            }, timer.sampling);
+            this.timers.push(newTimer);
+        };
 
         //update state
         this.timersState = true;
diff --git a/src/mainzone.js b/src/mainzone.js
index c3a3515..81bd7fe 100644
--- a/src/mainzone.js
+++ b/src/mainzone.js
@@ -349,7 +349,7 @@ class MainZone extends EventEmitter {
                     const sortInputsDisplayOrder = this.televisionService ? await this.displayOrder() : false;
 
                     //start check state
-                    this.denon.impulseGenerator.start([{ timerName: 'checkState', sampling: refreshInterval }]);
+                    this.denon.impulseGenerator.start([{ name: 'checkState', sampling: refreshInterval }]);
                 } catch (error) {
                     this.emit('error', `Prepare accessory error: ${error}`);
                     await new Promise(resolve => setTimeout(resolve, 15000));
diff --git a/src/surround.js b/src/surround.js
index d1c2cad..610582d 100644
--- a/src/surround.js
+++ b/src/surround.js
@@ -317,7 +317,7 @@ class Surround extends EventEmitter {
                     const sortInputsDisplayOrder = this.televisionService ? await this.displayOrder() : false;
 
                      //start check state
-                     this.denon.impulseGenerator.start([{ timerName: 'checkState', sampling: refreshInterval }]);
+                     this.denon.impulseGenerator.start([{ name: 'checkState', sampling: refreshInterval }]);
                 } catch (error) {
                     this.emit('error', `prepare accessory error: ${error}`);
                     await new Promise(resolve => setTimeout(resolve, 15000));
diff --git a/src/zone2.js b/src/zone2.js
index ef454c6..e44f97c 100644
--- a/src/zone2.js
+++ b/src/zone2.js
@@ -347,7 +347,7 @@ class Zone2 extends EventEmitter {
                     const sortInputsDisplayOrder = this.televisionService ? await this.displayOrder() : false;
 
                      //start check state
-                     this.denon.impulseGenerator.start([{ timerName: 'checkState', sampling: refreshInterval }]);
+                     this.denon.impulseGenerator.start([{ name: 'checkState', sampling: refreshInterval }]);
                 } catch (error) {
                     this.emit('error', `prepare accessory error: ${error}`);
                     await new Promise(resolve => setTimeout(resolve, 15000));
diff --git a/src/zone3.js b/src/zone3.js
index 051c5d2..f0774d3 100644
--- a/src/zone3.js
+++ b/src/zone3.js
@@ -347,7 +347,7 @@ class Zone3 extends EventEmitter {
                     const sortInputsDisplayOrder = this.televisionService ? await this.displayOrder() : false;
 
                     //start check state
-                    this.denon.impulseGenerator.start([{ timerName: 'checkState', sampling: refreshInterval }]);
+                    this.denon.impulseGenerator.start([{ name: 'checkState', sampling: refreshInterval }]);
                 } catch (error) {
                     this.emit('error', `prepare accessory error: ${error}`);
                     await new Promise(resolve => setTimeout(resolve, 15000));