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Probably not mirror flop - that would usually only happen once, particularly when crossing the meridian. This is happening every 9 or so subs. I have only ever seen real mirror flop once and the movement was a lot more than this - it seems to be controlled by using Celeston's suggestion of focusing upwards.
Maybe I need to re-grease my worm drives? I was surprised when I found that the movement was in the dec direction - particularly so regularly. If it is cyclical that seems to indicate an issue with the RA worm drive.
Next time I will watch the autoguider to see how much adjustment it is making in both axes. I've had the mount for 2 1/2 years - this problem only started a few weeks ago.
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