Mine pretty much only happens in areas where it's common for the highway or interstate to be closed due to wind (twice in one week on 285 in CO and once within the week on I80 in Wyoming). I'm all about functionality (why I buy Subaru) and I'm baffled by the decision to use frameless windows. It's especially baffling since Subies are frequently purchased specifically for mountainous weather where ice freezes/thaws on windows and causes the glass to get torqued at funny angles when operating because there's nothing to hold it in a track.
I'm going to remove the rear door panel and try to adjust the gussets (??) or whatever corrects window angle.