Hello, I'm new here, but not new to automotive forums

My mother has a 98 Camry with 180k miles or so on it. She tells me the driver's side power window sometimes does not close, but then it will start working again. I took apart the control panel and cleaned the switches with electrical contact cleaner. I've done this twice because the problem doesn't seem to go away.
Odd part is, after I've cleaned it, I tested it out and it's worked. But then she tells me after driving it, it would get stuck in the down position. But eventually will go up, little by little.
Before I go blindly replacing things, is there anything that tends to go bad in the power window electronics/mechanics of this car? I drive a 5th gen Corvette, and one of our common problems is a relay for our power door lock tends to get dirty. This causes the door not to lock sometime and the problem is not in the actuator but the relay. I'm wondering if her car is going through something similar.
Bad relay? Window motor gone bad?
Any help?