I would take engine apart and directly clip transformer leads to roller and frame, removing the wheel to track contact, then see if engine does same thing. If it does then I would check that the e unit armature is fully rotating the drum through one position and not stopping in an odd position. Another check would be if there is a frayed wire(s) that make intermittent shorts or open that trips the E unit coil from it "clunking" vibration. Is the on/off lever tightly fastened to board and making secure contact to the rivet connection?
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