[GrizHFMinimill] Mill controller woes

My X2 mill has started playing up again. First it started acting like the motor was cutting out during a cut. I checked all connections again. I even replaced the brushes. Now, under load or not the speed randomly jumps up to roughly twice the set speed. I can't afford to replace the controller now. Help! Is this the symptom of a fet going bad? I do believe I have some spares.

Chuck in E. TN

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