Side mirror glass adjusting itself while parked?

[mxwrk]

This is odd. I came out to my truck a couple weeks ago and noticed my drivers side rear view mirror glass was out of its normal position. Not a ton, but noticeable. I pressed my memory seating button and it adjusted back to where it should be. Fast forward a couple weeks and it does this almost every day when parked. I never see it move while operating the vehicle, it's never moved to the same place (always slightly different), Nobody else drives the truck, and I've folded the mirrors in and out numerous times and watched the glass to see if it moves out of position during that function and it doesn't. Any thoughts?

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[moog]

For me it's my seats. Can't really say I've had an issue with the mirrors but maybe once or twice.