Erik, I can fully understand your frustration. We have been battling the exact same problem with a G11 (G1 V4 gemini) for years now at the Mapleton Observarory. We have tried everything, including swapping power supplies, cables, gearboxes. Frankly I think its in the hand controller or the connection from the HC to the Gemini.
I've also had it happen occasionally on my home Gemini. I'm not sure if I solved the problem or not, but it hasn't happened in a while and I've never really found a satisfactory answer on the net, even after emails with Scott Losmandy. Good luck with it, I hope you solve it.
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