Sounds scary. I've slept through an alarm once to come back and find my mount 3-4hrs past the meridian with the camera having missed the pier by 10mm. Hopefully a "motor stall" would have saved you from disaster had a collision occurred.
As to the resyncing problem - I can only guess that a resync has occurred with the counterweights above the horizontal (i.e. scope pointed past the meridian). I recall something from the manual of this causing big problems. Not sure how you fix that - especially as I'm assuming this is a remote setup for you???
DT
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