Assuming it's not mechanical cables, stiction, etc. and not clouds or headlights or torch or the like zapping it (I had a BIG rhino beetle crawl over it once) there is a setting 'Reverse Dec output after meridian flip' that, at least in phd2, can magically be off occasionally. Whenever I see what you're seeing and it's not cables, it's that config switch that is to blame. I know ekos has it's own guide module but the symptoms are the same.
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