This weekend I got a new 4400 battery for my Pzr 4. After about 30 minutes into the first run with it everything was going great until my left track stopped working. Turned everything off checked it out, turned it back on and both tracks ran for a minute then the left stopped again. I tried driving in several directions and over ten minutes or so it would randomly work and then stop again. Any thoughts as to what might be causing this? My first assumption is that the power from the new battery somehow messed with the circuit board.