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Have you physically measured the focus position over time to see if it is actually changing to reflect the numbers from the Robofocus? If it is, then you have something going on with the scope (are you testing at times when the ambient temp is stable?) If the focus position is physically staying the same and the Robofocus position is moving then the problem is with the focuser or Robofocus. Divide and conquer!
Cheers,
Rick.
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