Has anyone else had their front power windows jump off track? Both of my front door windows will roll up about 3\4 way and then pop loudly before jumping back on track. I have pulled off both door panels, reset the windows in the track, and bent the tracks to make the window roll up correctly. However,this is only a temporary fix as they do it again within a week. I drove two other Blazers before purchasing my 1990, and they all did this. Is this a common problem? Is there a permanent solution? The problem is so bad that I have to manually pull up the pass. window. Any Ideas? I did a forum search, but nothing really turned up for this problem.