OK, tonight we had some clear sky again, and I ran the following test scenarios:

1) ASI1600MM-Pro, EFW filterwheel connected
Imaging only
2) ASI1600MM-Pro, EFW filterwheel, Microtouch focuser connected
Focusing
Imaging
3) ASI1600MM-Pro, EFW filterwheel, Microtouch focuser, Skywatcher Az-Eq6 mount (EQDir) connected
GoTo
Tracking
Focusing
Platesolve
Imaging
4) ASI1600MM-Pro, EFW filterwheel, Microtouch focuser, Skywatcher Az-Eq6 mount (EQDir), ASI120MM Guidecam connected
GoTo
Tracking
Focusing
Platesolve
Autoguiding
Imaging

The result seems to be that scenario 1 and 2 works nice. But when the mount is connected, the trouble starts.
For scenario 3 and 4 (when mount is tracking), I experience crash after just one to two images. I also saw one crash during plate solve.
So whether or not autoguiding does not seem to matter. Mount in operation seems to be a clue.

/Odd

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