Window Motor

I have replaced the drivers side window motor 3 times in the last few months for my 1991 LX 5.0 convertible. I just replaced the latest motor 3 weeks ago!

When the window gets to the very top and my hand is pushing the window button it makes a terrible racket. Window goes up and down fine except when the window hits the very top.

Sometimes I go 6 or 8 weeks before hearing this sound but this time just 3 weeks.

Any idea on what is causing this and how to fix? :shrug:


Thanks

Larry