the power window switch always had problems in the relay and this occurs because of the dirty connections, then best one can do is to clean its connections...

 

I have yet to find an aftermarket windows switch that works so I just used parts from the new switch to repair the old switch. good as new

 

My driverside window worked perfectly fine ... Until one day I partially put the window down and someone came over to talk to me and leaned on it...
Thus derailing it...Grrrrr

Needless to say... I took it home afterwards and took the window/door panel apart..

The glass had actually hung on the wire harness to the window... Thus stretching the connection at the switch... and putting it in a bind...
After realigning the window... I too experienced an auto down issue... I took the connector and the switch apart only to discover the switch looked a little tarnished and the stress on the wiring at the connector also was pulled away some from the actual connector... I managed to repair it enough to where it now operates pretty much normal... once in a blue moon it gets stuck in the down position... All I have to do is reopen the door and close it and it returns to operating normal again...

Maybe,
Someone did the same thing to your moms Monte thus resulting in a shorting window switch? Me personally.. rather than keep buying a new one at the dealer... I would pick one up from your local junkyard/pullapart and reman it before you install it? also paying attention to the connector and give it as through once over to eliminate any further problems in the future with a touch of dielectric grease to help make a good connection.