This used to happen occasionally on our X3's rear right window. The auto-up would not work on occasion, and as a result the convenience close would also not work (I walked back from the store in shock, wondering why there was a gaping hole and thinking if something was stolen).

However, this is one electronic glitch that has stopped happening over time. I don't think its the pressure sensor, because in my case, the "non-auto up" position on the window switch would do nothing at all. Normally, you pull up a lil bit to roll it up until you let off; you pull it past the resistance point for the "express/auto up" function. But when it malfunctioned on the X3, pulling it a lil bit did nothing, and pulling it for the auto-up resulted in a "non-auto" up.