Hi,
I've had what I thought was a similar problem, as often when I set off they are half down and I have to press the buttons to angle them normally.
I actually have figured out that if I am reversing into a spot/our car port, I often go into park from reverse, and turn off the engine immediately. The mirrors are often slowly going back to their usual forward facing spot.
I have to wait a few seconds now after reversing prior to switching off the engine.
Could this be your issue too by chance?
L
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