It is a common problem with the power drive v2. Mine would also start spinning as I was trolling along. I finally came to
the conclusion that moisture was causing it. I put a water proof cover over it when rain was imminent and the problem
went away. It would also stop working for a day or two and the next day it would work fine. All this cleared up when I kept
water out of it. You would think, as much as they cost and made to use outdoors, that the unit would be sealed. I now
have a terrova and have had no problems with it. I probably should not have said that.