Fix for stuck window instead of banging on it?

[samms95s14se]

Too much window stuff to sort through in search=headache.... I just need to know what is the permanent fix for my driverside window that onlly works when I give it a little bang on the fabric part of the door panel under the window switch controls!!! Who knows the exact cause of the problem and how to fix it?? I'm sure the bang on it method won't work one day, thanks for any help.

[SochBAT]

the little black box thats hidden in the panel.

Swap it out.

[samms95s14se]

Thanks! where is it located ? Is it easy to remove ? and what is it called and how much to replace?

[projectRDM]

It's white, not black. And it's called the window amplifier.