@bruce19 +1
To OP, However you determined this phenomenon, will you be able to tell if "the cure" works as advertised?
I would absolutely do the least intrusive remedy. Simply to ease your brain.
A healthy amount of blue tack placed strategically might be your ticket. Let us know
Or if you're all in on this...get a tube of green glue and spread it liberally on the offending board. Beware it will wander.
This poster is not responsible for any misadventures you may have.
Regards,
barts