Mine has been amazing. I wouldn’t trade it for any other motor. Fuel mileage is great and the power is effortless and will push you in the seat till you let off. The sound is pretty awesome too. It’s amazing how many people look twice as I drive by through parking lots.
If that was the case it wouldn’t have started again the first time. These Aux batteries can cause all kinds of problems. I would start there, it’s a fairly easy task to experiment with.