Recently the rear window shade on my UL is malfunctioning. Sometimes only one side retracts on the way down binding the assembly. Other times it goes down OK but then only one side tries to come back up, binding it. (it's random, it's not always the same side that tries going up/down first)

Any common problems/fixes with these? Thanks

 

Found the problem, the actual shade part no longer has tension/does not retract. Same problem with right rear door shade.