last week was the first time i used my new minkota ap 55 lb thrust power drive i bought almost a month ago. used it about thirty minutes, no problem. then i picked it up, moved to a new location and dropped it and it wouldnt turn to the left or right. motor would run straight ahead but wouldnt turn. the ap light would come on but the motor wouldnt turn to the left or right. after an hour or so, i tried it again and it was working fine. worked fine the rest of the day.. today done the same thing, but this time when it wouldnt work, i unhooked the power supply and hooked it back up and it started working. worked the rest of the day with no problem.. anybody got any thoughts on why its working to start off with, then stops working and when i unhook the power then hook it back up and it works perfectly all day?