Not sure how you are using your board. Or how much the faders are moving.
We power off every day.
Then when the next user turns it on and signs in they select the scene that they will use for their start point.
That resets everything to the original setting for their use.
Save your current set up. Power off and then restart.
Make any adjustments that are needed.
Then if you are not using AMM or other features that would change the fader settings you would appear to have a hardware problem.