1996 850 Wagon, N/A, manual

Another minor annoyance. This weekend the driver's-side window decided not go all the way down in response to quickly depressing and releasing the driver's-side window switch to cause it to go into the "auto-down" mode. The window stops about 2" shy of where it normally disappears into the door. I can cause it to complete its motion by manually depressing the window switch until the window dissappears.

Does anyone know how the bottom stop location is controlled in the "auto-down" mode? Is this an adjustment on the regulator?

Thanks.