Thank you for the response Paul.
I am accurately polar aligned - I've been using K3CCD drift explorer with a webcam and have been able to obtain a very accurate polar alignment.
In any event, I do not see how polar misaligment would cause random spurts of RA drift. The star randomly trails off to the right for about 1.5 seconds before stopping.
I understand that there will always be some level of RA drift, but this problem is almost like the tracking turns off for about 1.5 seconds before settling down and tracking again.
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