Sidewinder cuts out after a few min.

Bet your glad it's not another dead MMM thread....

After about 4 min of racing, my sidewinder cuts out, then comes right back on. Can someone help my troubleshoot.

It's a sidewinder on 2s with a CC 5700 motor running a 16t pinion. The car is a zx-5.

I have removed the switch and soldered the power button. I knowit's not the battery. This only happens after a few min, maybe it's getting too hot and thermaling? The motor isn't very hot at all at this point. Haven't tried a temp gun yet.