Have a TotGuard 26" bike that worked fine last summer with 5 pedal assist levels up to about 20 MPH. After removing battery for winter storage, when I went to ride this spring, the bike wants to go full speed all the time now. Tried playing with settings, but only thing I could do was trim down max speed and it would always go max speed (where ever I had that set), so it can sense the speed correctly, but will always want to go whatever the max speed is. I am guessing a failed or shorted sensor or something. Anyone have any idea what the problem might be that would cause this?