Not from the problem statement here, but if you’d like to show us some logs over an AF run that exhibits these symptoms, we can look.
In terms of general advice, it’s difficult because there are many variables in play. The most common issues though are:
- Issues with focuser traction against gravity
- Issues with focuser backlash
- Insufficient step size or data points makes the regression inaccurate. As a rule of thumb, whatever combination of these 2 numbers that you use, the HFR measurement of the first image in the AF run should be approximately 2.5-3x the HFR you expect at focus.
Guidance on submitting logs:
Here is further