G'Day,
One reason that occurs to me is that you may have had 22Khz on with your hummy. I've had this problem, and tore my hair out before I found the reason. Motor drive is supposed to be in the nulls of the 22Khz, but gets at cross purposes for some reason. May only happen with some STBs.
Hope this solves your problem, otherwise we will have to look further.
I doubt that you will need to get on the roof to fix.
Another possibility is when saving Motor position, you did it in the first null position.
Kindest Regards, " The Druid ".
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