I had the same problem. I completely removed the motor and took out the 2 screws holding the motor together. I found that the bushings were not worn at all, but the oven side bushing was loose. There's ring "clip" holding the busing in place. The clip looks like an inside out flower (pedals facing inward instead of outward). I applied some pressure on opposing pedals with a pair of needle nose pliers to reseat the busing and tighten it up. That removed all play in the shaft. After reassembling everything the noise was gone and the motor no longer stalled.