I had both sides of the rear windows pop off the motors today. I had rear passengers that were using the windows alot. When I disassembled both of them it was the same thing on both sides. The roller on the motor assembly looks like it pops out the rear of the window track. It looks to me like the window has some side to side play in the track. Does this sound like worn window runs or is there other parts that should be keeping the motor mechanism in the window track?