Over the past few days I've encountered a problem with the driver's window on my Signature Model S. Normally when the door is opened while the window is fully up (closed) the window lowers by a small amount. Then when the door is closed, the window returns to its fully closed position automatically. We have all gotten used to this behavior. Now though, intermittently, when I open the door the window moves downward a bit, but when I close the door it doesn't go back up. If I repeatedly open and close the door the window keeps lowering a little bit until it's fully open. If I notice that the window is doing this and I press the window switch on the door to close the window myself, one of two things happens: 1. Nothing happens, but the other three windows/switches work fine. Only after the window has fully opened by repeatedly opening and closing the door will the switch work again to close the window properly. 2. None of the window switches on the door do anything until I sit down and press the brake to turn on the car. At that point the window switches all work, but the driver window only closes if I hold down the switch. In other words, the one-touch close function does not work. The fix for this seems to be to open the window fully by holding down the switch. After that something apparently resets and the window works normally again for a while. The window mechanism seems to be working normally, so I now wonder if this is a software problem. Has anyone else encountered this? I just had my car in for service for a bunch of other things, none related to the window, and hesitate to call service again about this if everyone's having this happen and it'll be fixed in the next update.