diff --git a/src/core/atcore.cpp b/src/core/atcore.cpp
--- a/src/core/atcore.cpp
+++ b/src/core/atcore.cpp
@@ -255,7 +255,9 @@
         } else {
             loadFirmwarePlugin(fwName);
         }
-        d->serialTimer.stop();
+        if (d->serialTimer.isActive()) {
+            d->serialTimer.stop();
+        }
         return true;
     }
     qCDebug(ATCORE_CORE) << "Failed to open device for Read / Write.";
@@ -314,9 +316,14 @@
 {
     newTime = std::max(newTime, 0);
     if (newTime != d->serialTimer.interval()) {
+        d->serialTimer.setInterval(newTime);
         emit serialTimerIntervalChanged(newTime);
     }
-    d->serialTimer.start(newTime);
+    if (newTime == 0 && d->serialTimer.isActive()) {
+        d->serialTimer.stop();
+    } else {
+        d->serialTimer.start(newTime);
+    }
 }
 
 int AtCore::temperatureTimerInterval() const
@@ -328,9 +335,14 @@
 {
     newTime = std::max(newTime, 0);
     if (newTime != d->temperatureTimer.interval()) {
+        d->temperatureTimer.setInterval(newTime);
         emit temperatureTimerIntervalChanged(newTime);
     }
-    d->temperatureTimer.start(newTime);
+    if (!newTime && d->temperatureTimer.isActive()) {
+        d->temperatureTimer.stop();
+    } else {
+        d->temperatureTimer.start(newTime);
+    }
 }
 
 void AtCore::newMessage(const QByteArray &message)
@@ -468,7 +480,9 @@
         if (state == AtCore::STATES::FINISHEDPRINT && d->sdCardPrinting) {
             //Clean up the sd card print
             d->sdCardPrinting = false;
-            d->sdPrintProgressTimer.stop();
+            if (d->sdPrintProgressTimer.isActive()) {
+                d->sdPrintProgressTimer.stop();
+            }
         }
         emit stateChanged(d->printerState);
     }
diff --git a/src/widgets/statuswidget.cpp b/src/widgets/statuswidget.cpp
--- a/src/widgets/statuswidget.cpp
+++ b/src/widgets/statuswidget.cpp
@@ -95,7 +95,9 @@
         printTime->start();
         printTimer->start();
     } else {
-        printTimer->stop();
+        if (printTimer->isActive()) {
+            printTimer->stop();
+        }
         spacer->changeSize(10, 20, QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);
     }
 }