I have one on the trolling motor. A decent fishfinder but it gives really wierd readings in shALLow water. Anything less than 4ft and it starts flashing and won't work for a few minutes. Then last nite it started going off periodically like I had turned it off. I could push every button and nothing . Then about an hour later it justcame back on like nothing happened. I checked all the wiring and connections. I didn't know if anybody had any suggestions? Thanks