I have a 300 watt powered 12" sub and a 4 channel jbl marine amp 60 rms x 4. Running off the stock OEM battery on my rzr 1000. Runs and plays just fine while idling. But when I start riding it cuts in and out and won't even let me engage 4 wheel drive. But when I turn off the system it goes to running fine again. What could be the problem? Don't think the battery is not enough power since it plays and runs just fine at idle.