I'm running two separate tracks on an MRC 220 controller, just DC. A 22" oval with an 18" oval inside it. Works fine 98% of the time , but from time to time, if both trains are going slowly, they will stop and then no response from controller. If I turn off power, for even just a few minutes, then turn back on, both trains are running fine again. Is there some sort of breaker or overload protector built into the MRC 220? Unit is just barely warm, no signs of being too hot, no odor or anything. Just do not want to damage anything.---J R