QGroudncontrol problem

OpenHD connection is working well. But when i start qgroundcontrol(versions tried:4.1.0 to 4.1.3) i get quite often ‘manual contol lost’, the video from the drone cam is getting and i can see those error messages in the console:
‘Error writing to QHostAddress(“192.168.2.1”) 46387’
Is it some setting that i miss?