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Another possibility that just occurred to me is the reverse of binding but would also cause your problem - are some parts a bit too loose and the drive motors are slipping?
Looking again at that manual I downloaded, I can see there's an altitude motor box on one of the upright arms, although I can't see how this drives the angle of the scope barrel. Is it just friction drive by a rubberised wheel and if so, could it be slipping a bit when it should be gripping?
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