Yep, most likely a bad ground. Unrelated, but it reminded me of a time ago when my motorcycle had a short in the brake light system (from previous owners ghetto wiring), so everytime I tapped the front brakes all the electronics would shut down after I blew the fuse.
I remember when I finally traced the problem (brake lights, and what a fucking nightmare) using the brakes right for the first time was so refreshing.
Non sequitur I hope you've found the solution.
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