I can appreciate your frustration and feel for you!
The only other time I had what might be a similar experience, although only in GoTo slews rather than auto guiding, was when on my Vixen GPDX mount, one of the tiny grub screws that locks the brass gear on the worm shaft loosened and so was slipping, but not every time.
All I can suggest is to go through the mechanical drive train and check that something similar hasn’t occurred? Also, just make sure that all the locking clamps, clutches, etc. on the mount are clamped firmly.
Good luck!
Cheers
Dennis
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