Did you manage to resolve this? I have been having similar problems - Kstars crashes, the mount keeps tracking. Same thing last night (on a v clear night!). What should have been 4 hrs of sub returned 27 mins. Ah well. The only thing I did differently last night was that I left guide at Bin 1x1 (normally I leave it 2x2) - no idea whether that might be a factor, not a software person!