I know this isn't woodworking related but I thought this was the best place to ask. So I was cutting a piece of metal with my angle grinder last night. The cutoff wheel was binding a little bit, then all of a sudden something popped and it quit running. The gearbox was really hot. I thought maybe the circuit breaker had popped but it hadn't. I let it set and cool down but it still doesn't work. The grinder is a Dewalt small 4 1/2 inch grinder. What is going on you think?