Xc40 Sunroof sticking on auto close?

[Csea2]

Good-day to all. I wanted to see if anyone has had a problem when closing the sunroof/moonroof? Recent I’ve developed a sticking with vibrations when I hit auto close. Sometimes it stops so hard that it backups. I can close it if I do it slowly in manual mode. I’ve cleaned the tracks and used a high temp grease on the tracks but it didn’t help much. I did noticed when I cleaned the tracks that I had some rusted metal chips, which I removed using a magnet.

Not sure what to try next, and hate to take it to the dealer. Thanks Chris