If it becomes repeatable you have a fault, pure and simple.
I get the feeling that at the factory SW merely power up each mounts and press a few buttons to see if it slews in each direction, and that’s considered ok.
Clearly from my experience they do not check that a polar alignment actually work using known coordinates of reference stars at a known date and time, and that a GOTO does go to the correct position accurately for a defined object/date/time.
I’m also sceptical about the use of the “secondary encoders”; why would you ever disable them if they actually worked as advertised ? That there is a setting to disable them suggests a hardware issue, or a defect in the firmware that they never quite sorted out.
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