RTV X1100c Driver window difficult

Hi all, has anyone had issues with roll up windows getting cranky? My driver door window sags at the front end while rolling up. I have to grab the window and pull it vertically to get it to go up. Passenger window is normal. I am trying to understand why before I tear into the door. I was thinking that it may be that the regulator isn't aligned right, or that the chanel that the window rides in has come loose so it isn't guided straight? Looks lie I might be able to access these...

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RTV X1100c Driver window difficult