Hahah so I used to think that my seat was adjusting itself as well because slowly after the whole week my seat would slowly end up upright and then I finally figured it out when I was swinging my body and leg around to get out of the car the side of my seat pushes down just enough from the weight of my body and my leg that it presses on the seat upright button just a little each time until the seat is completely upright and then I have to readjust it to a comfortable slope again. Repeat. Once I figured that out I just adjusted the way I get out of the car to try to avoid the button and it's been fine so it's possible you're hitting that when you're getting out of the car and not noticing it.
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