diff --git a/ADHamaApp/src/hama.cpp b/ADHamaApp/src/hama.cpp
index c492afe..bb07622 100644
--- a/ADHamaApp/src/hama.cpp
+++ b/ADHamaApp/src/hama.cpp
@@ -496,12 +496,17 @@ epicsTimeStamp imageStamp;
 
     //static const char *functionName = "imageTask";
 
+    lock();
+
     while(1) {
         getIntegerParam(ADAcquire, &acquire);
         if(!acquire) { 
-            puts("Waitng start");
+            puts("Waiting start");
+
+            unlock();
             status = epicsEventWait(startAcquireEventId_);
             puts("Starting request received");
+            lock();
 
             /* We are acquiring. */
             //acquireStatusError = 0;
@@ -520,7 +525,7 @@ epicsTimeStamp imageStamp;
                 epicsTimeGetCurrent(&startTime);
                 prevAcquisitionCount = 0;
             }
-        }
+         }
 
         eventStatus = epicsEventWaitWithTimeout(this->stopAcquireEventId_, 0);
         /* Stop event detected */
@@ -536,7 +541,9 @@ epicsTimeStamp imageStamp;
         epicsThreadSleep(0.001);
 
         // get image transfer status.
+        unlock();
         imageTransferStatus(m_hdcam, captransferinfo);
+        lock();
 
         if (prevAcquisitionCount < captransferinfo.nFrameCount) {
             //printf("nFrameCount: %d, nNewestFrameIndex: %d\n", captransferinfo.nFrameCount, captransferinfo.nNewestFrameIndex);