My passenger side mirror seems to "fall" while I'm driving. I can move it into proper position and shortly after, it seems to slowly drop down. There is no problem with moving the mirrors or folding them. It's not the reverse feature. This is happening while driving. Sometimes I end up readjusting the mirror several times while traveling to a destination. Has anyone experienced this or have any possible solutions? It's a 2023 AT4 2500 Sierra. Approx. 3000 miles.