This has been happening for the past 6 months or so probably. I've just now gotten around to trying to figure out what the problem is. Has anyone here experienced this before?

It only happens when I roll the window down, never when I roll it up. It also seems to be worse after it's been rolled up for a while, i.e. overnight.

 

Really hard to see from your video, to be honest. That said, could be as simple as needing some lube in the regulator assembly/track. I would also check the rubber that seals against the window down at bottom. If that gets bound up on the way down, it could be the cause of your problem.

 

Yeah, you definitely can't really see it in the video. If you can ignore the loud *** cicadas then you can hear the shaking right as the window starts to go down (might have to turn it up to hear it). But yeah I assume it's something with the track or seal but wanted to see if anyone knows from personal experience what it is. Thanks for the tips though, I'll definitely check those things out.