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Happened to me a lot in the past. It can be quite annoying yes?
Also if you are using an SBIG camera you can do callibration using the main imaging chip.
No other bright stars can move in to the field during the callibration or the software will think the orginal star did not move enough and pick the new star as if its the original one.
Also make sure you use autodarks because a hot pixel if bright enough will be picked over a star and of course it does not move.
Use 2x2 binning on your autoguider, cold as you can get it, no other bright star around, use subframing to frame it, use autodark and about 30 seconds for callibration time. That should do it.
Greg.
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