Nice M3! Try this easy fix for your window auto-up feature:
I had the same exact problem. When I would press the switch for "up" the window would go about 1/4 up, then stop and go back down. I would have to press it again and hold it down for it to go back up all the way. The window has been like this since I purchased the car last year.
I did a "reset" to the regulator, and that totally fixed it. It works 100% now, and I didn't need to take anything apart.
First, press AND HOLD the "down" button on the window switch. Keep on holding until the window goes down, and still hold for about 10 seconds. Then press AND HOLD the "up" button on the window switch. After the window fully closes, keep on holding the button down for about 10 seconds.
Then go full down, then press the up once, and see if it automatically goes all the way until closing. If it does not, then repeat the procedure above.
It took me three attempts at the reset procedure before it was working as normally.
Hope this helps!