I sometimes have my Synscan playing up like that after stopping a slew with ESC. It would stop tracking in RA (or track at a much too slow rate) and I have to go into settings, set the tracking rate to lunar (or something) and back to sidereal. I wouldn't think that this sort of bug would survive power cycling, so your issue may be different. But it's worth a try, I guess.
Cheers
Steffen.
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