I had those symptoms when my Valhalla board died. You could look into the DC motor kits out there for a few hundred bucks for the LP12. They get good feedback but I haven’t heard one.
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I agree to start with removing cap, spring and ball before doing anything. It will do exactly what you discribe. It's easy to do, just do it slow because spring can through ball and you will be on your hands and knees looking for it like I did. Soon as I did it problem solved. Mine did it with Pink Triangle pink link power supply not lingo.
I removed the cap/spring/ball from the bottom of the motor as suggested by 'paulcreed'. Everything seems to work perfectly now, would not have thought that doing this would have made any difference. As a consequence I have vertical 'play' in the motor shaft, can move it up and down by about 3mm. I read somewhere that a hole should be drilled in the bottom of the cap, a nylon nut would then be glued on the inside of the cap above the hole, and then cap cap stuck back onto the bottom of the motor housing with nail varnish. One the varnish is dry a nylon bolt can be threaded into the nut and turned until the vertical slack is removed from the motor shaft; has anyone tried this?