I'm experiencing the same issue at times with the rear driver window on our 2018 650i. One thing I noticed is, if I push the window button up in letting it raise/lower as desired, it works fine. The issue only appears when I engage the switch fully in raising/lowering the window. I'm assuming it's a switch and/or a sensor issue with ours. I'll be taking it in soon for them to troubleshoot.
Ralph
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