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have you looked at the gearing? there should be a plastic piece that the balls get picked up by. You will have to pull the regulator out to check this, but This can cause the window not to go up or down correctly. The only other thing to check is the tracks the window travels up and down in. That too can cause it to act wierd. But the downside is you need to pull the door panel off and the window out. Not hard, but if you have a second person it helps a little when you pull the glass out.
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