I emailed a BMW CCA tech adviser but figured I'd post this on the forum as well. I'm having an issue with my drivers side window. When attempting to raise or lower the window it will only go up or down in short bursts and requires multiple switch presses to completely open or close. This is a random problem and "re-training" the switch only temporarily corrected the issue. I'm thinking a motor and/or regulator issue? Any advice would be greatly appreciated. My car is a 2013 328i xDrive...build date 3/2013.