Dash Air Vent Not Closing

Noticed on mine today, the left hand of the 2 center air vents will not close, the roller wheel barely moves down from the top position, and by hand you can only point the vents downwards, but not close flat it like you can the right hand one.

I guess it means back to the dealer for more warranty work, but wondering if anyone has had similar fault or had it repaired or managed to get it working again?

This morning with cooler temps I managed to ease the roller wheel back into position with a little constant pressure and felt it click back, I wonder if these hot temps on the dash recently had caused it to expand and come unclipped. Working perfectly again