07 Fleetwood Discovery 39S - The Dometic power patio awning extends ok but the motor strains when retracting. It seems slow and sometimes it stops about 2/3 closed. After waiting 5 - 10 minutes and then trying again, it will close. I am now hesitant about extending the awning for fear that it won't fully retract. The condition is the same using either the box control or the remote. The entrance door power awning seems ok. Anyone have thoughts on this?