I hvae been getting this pop sound or rather it sounds like someone gave a quick tap on the glass window when I open the door and/or rolling down the window.

It seems like the glass maybe sticking to the rubber seal around the door frame, but I had already applied some silicone lub along that rubber seal so it shouldn't stick. But today as I open the door there goes that glass tap sound again.

This sound does go away if I open and close the door a few times consecutively. Or roll down and up the window a few times. But the sound would come back again after the door /window have been shut for a few minutes.

Has anyone experienced this?