Index: sources/view/hd/adjustment/common/VCommonAdjustmentVitals.cpp
===================================================================
diff -u -rc9f8f8cf3c6c37fc6460d8675c62c9442c4d4263 -rb54264a622d738efdafe842942921b6840828914
--- sources/view/hd/adjustment/common/VCommonAdjustmentVitals.cpp	(.../VCommonAdjustmentVitals.cpp)	(revision c9f8f8cf3c6c37fc6460d8675c62c9442c4d4263)
+++ sources/view/hd/adjustment/common/VCommonAdjustmentVitals.cpp	(.../VCommonAdjustmentVitals.cpp)	(revision b54264a622d738efdafe842942921b6840828914)
@@ -31,8 +31,8 @@
 void View::VTreatmentVitals::initConnections() {
     ACTION_RECEIVE_BRIDGE_CONNECTION(_BluetoothInterface, UIBloodPressureData);
 
-    connect(this, SIGNAL( intervalChanged       (const quint8 &)),
-            this,   SLOT(onTimerChanged         (              )));
+    connect(this, SIGNAL(  intervalChanged  (const quint8 &)),
+            this,   SLOT(onIntervalChanged  (              )));
 }
 
 /*!
@@ -171,23 +171,26 @@
  */
 void View::VTreatmentVitals::timerEvent(QTimerEvent *)
 {
+    if ( ! _timerId  ) return; // No timer started or failed starting
     if ( ! _interval ) return; // if interval is 0/OFF return
 
-    _secCounter++;
-    if ( _secCounter % 60 ) return; // only check every minute
+    // DEBUG: qDebug() << __FUNCTION__ << _counter_sec << _counter_min << _interval << _timerId;
+    _counter_sec++;
+    if ( _counter_sec % 60 ) return; // only check every minute
 
-    if ( ! _timerCounter ) {
+    if ( ! _counter_min ) {
         timerStop();
         emit didTrigger();
     }
     else {
-        _timerCounter--;
-        _secCounter = 0;
+        _counter_min--;
+        _counter_sec = 0;
     }
 }
 
-void View::VTreatmentVitals::onTimerChanged()
+void View::VTreatmentVitals::onIntervalChanged()
 {
+    // DEBUG: qDebug() << __FUNCTION__ << _counter_sec << _counter_min << _interval << _timerId;
     if ( _interval ) timerReset();
     else             timerStop (); // Timer stop is resetting timer too.
 }
@@ -199,6 +202,10 @@
  */
 void View::VTreatmentVitals::timerStart()
 {
+    if (   _timerId  ) killTimer(_timerId); // this typically should not happen.
+    if ( ! _interval ) return;              // if interval is 0/OFF return
+    // DEBUG: qDebug() << __FUNCTION__ << _counter_sec << _counter_min << _interval << _timerId;
+    timerReset();
     _timerId = startTimer(1000); // 1 sec interval which will used as 1 min in timerEvent (easier to debug)
 }
 
@@ -207,12 +214,13 @@
 {
     if ( _interval ) {
         // ( -1 ) :the interval is 0 based but if as an example we set the counter to 5 then 5 itself gets a minute to pass which makes it 6 min.
-        _timerCounter = _interval - 1;
+        _counter_min = _interval - 1;
     }
     else { // if _interval == 0, counter should set to 0 too not to -1
-        _timerCounter = 0;
+        _counter_min = 0;
     }
-    _secCounter = 0;
+    _counter_sec = 0;
+    // DEBUG: qDebug() << __FUNCTION__ << _counter_sec << _counter_min << _interval << _timerId;
 }
 
 /*!
@@ -221,6 +229,8 @@
  */
 void View::VTreatmentVitals::timerStop()
 {
+    if ( ! _timerId  ) return; // No timer started or failed starting
+    // DEBUG: qDebug() << __FUNCTION__ << _counter_sec << _counter_min << _interval << _timerId;
     killTimer(_timerId);
     _timerId        = 0;
     timerReset();