i can not say that i have a 'sticky' window seal as you described it, in other words I don't have that problem with the window seals on my Legacy.I'll repeat my fix. It only happen on really hot days when I'd open the window to cool the car as I drove off. The window rubber seal was sticky and right as the window would hit the top, it would grab a little. Once I cleaned the rubber seal/gasket and it wasn't sticky on hot days, the problem went away. Much easier than opening the door and lubing the tracks. I'm assuming a dirty handed tech grabbed that area getting in and out of the car since it didn't do it new.
I've experienced the problem in cold ambient environments, not just warm/hot.