I had similar things happen with the eq8 over the w'end, the coldest weather I've used it in. my return rate for subs was quite terrible. I was going to put it down to me setting up when exhausted and therefore a more shonky polar alignment than usual but perhaps the cold required clutches etc to be tighter (although I usually have them pretty tight). I don't know though, last night I decided to realign with some more care (left scope out all w'end) and it was shooting M16 like a champ - dead on, however after I shifted to ngc 6559 it was hot and cold (and they aren't that far apart in the sky) in fact I gave up on it and went to corona australis.
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