Are these the original regulators that came with the car anywhere from 7-14 years ago? or are these regulators that are only a year or 2 old? I have replaced the original regulator in one of my cars with a used one from a junkyard and the used one had no issues ( it's been about 4 years now) and my other car I added power windows (about 2 years) and they go up and down several times a day every day with no problems.