Power window woes

[loonmobile]

My 2001 LE driver's window works intermittently. After engaging the window switch, the window peters out before closing, kind of like what happens when a battery operated device fails when the batteries run out. If I wait a few minutes or turn the car off, then restart it, the window might close like nothing was ever wrong, but often not on the first try. Luckily, I have always been able to get the window closed. This problem repeats, not every time I use my window, but frequently enough so that I'm refraining from using it unless necessary. I need to fix it before it completely craps out. Any idea what might be wrong and how much it might cost to fix?

Thanks so much!

hu