diff --git a/internal/pkg/onuadaptercore/mib_sync.go b/internal/pkg/onuadaptercore/mib_sync.go
index 3439375..5ac2d15 100644
--- a/internal/pkg/onuadaptercore/mib_sync.go
+++ b/internal/pkg/onuadaptercore/mib_sync.go
@@ -403,6 +403,9 @@
 
 func (oo *OnuDeviceEntry) processMibSyncMessages(ctx context.Context) {
 	logger.Debugw(ctx, "MibSync Msg", log.Fields{"Start routine to process OMCI-messages for device-id": oo.deviceID})
+	oo.mutexMibSyncMsgProcessorRunning.Lock()
+	oo.mibSyncMsgProcessorRunning = true
+	oo.mutexMibSyncMsgProcessorRunning.Unlock()
 loop:
 	for {
 		// case <-ctx.Done():
@@ -411,6 +414,9 @@
 		message, ok := <-oo.pMibUploadFsm.commChan
 		if !ok {
 			logger.Info(ctx, "MibSync Msg", log.Fields{"Message couldn't be read from channel for device-id": oo.deviceID})
+			oo.mutexMibSyncMsgProcessorRunning.Lock()
+			oo.mibSyncMsgProcessorRunning = false
+			oo.mutexMibSyncMsgProcessorRunning.Unlock()
 			break loop
 		}
 		logger.Debugw(ctx, "MibSync Msg", log.Fields{"Received message on ONU MibSyncChan for device-id": oo.deviceID})
@@ -420,6 +426,9 @@
 			msg, _ := message.Data.(TestMessage)
 			if msg.TestMessageVal == AbortMessageProcessing {
 				logger.Debugw(ctx, "MibSync Msg abort ProcessMsg", log.Fields{"for device-id": oo.deviceID})
+				oo.mutexMibSyncMsgProcessorRunning.Lock()
+				oo.mibSyncMsgProcessorRunning = false
+				oo.mutexMibSyncMsgProcessorRunning.Unlock()
 				break loop
 			}
 			oo.handleTestMsg(ctx, msg)
@@ -1105,6 +1114,8 @@
 	if oo.baseDeviceHandler.isReconciling() {
 		oo.baseDeviceHandler.stopReconciling(ctx, false)
 	}
+	oo.mutexMibSyncMsgProcessorRunning.RLock()
+	defer oo.mutexMibSyncMsgProcessorRunning.RUnlock()
 	//the MibSync FSM might be active all the ONU-active time,
 	// hence it must be stopped unconditionally
 	pMibUlFsm := oo.pMibUploadFsm
diff --git a/internal/pkg/onuadaptercore/onu_device_entry.go b/internal/pkg/onuadaptercore/onu_device_entry.go
index 5de76bc..18bd1ef 100644
--- a/internal/pkg/onuadaptercore/onu_device_entry.go
+++ b/internal/pkg/onuadaptercore/onu_device_entry.go
@@ -300,9 +300,11 @@
 	//mibNextDbResync uint32
 
 	// for mibUpload
-	pMibUploadFsm          *AdapterFsm //could be handled dynamically and more general as pAdapterFsm - perhaps later
-	mutexLastTxParamStruct sync.RWMutex
-	lastTxParamStruct      sLastTxMeParameter
+	pMibUploadFsm                   *AdapterFsm //could be handled dynamically and more general as pAdapterFsm - perhaps later
+	mutexLastTxParamStruct          sync.RWMutex
+	lastTxParamStruct               sLastTxMeParameter
+	mibSyncMsgProcessorRunning      bool
+	mutexMibSyncMsgProcessorRunning sync.RWMutex
 	// for mibDownload
 	pMibDownloadFsm *AdapterFsm //could be handled dynamically and more general as pAdapterFsm - perhaps later
 	//remark: general usage of pAdapterFsm would require generalization of commChan  usage and internal event setting