I have a 1/10 exceed sunfire brush motor. I've been using it for a couple of weeks on rough terrain, driving it fast. Over the past few days it has slowed down considerably, and now only goes about 5mph. Do you think I could have burned out the motor? any other ideas? solutions? After going slow, it will click a little, then the motor won't work, only the steering works. If I turn it off/on, the beeps are weak-sounding until about the 3rd time of power-cycling. Yes, the batteries are always fully-charged, 7.2V nimh. It's a 540 brush motor, ESC SP 03018. Thanks for your help.