You should check the rubber weatherstripping, my cars's sunroof works nice - lifts and slides but sometimes jams and used to act up - so I decided to clean and lube the tracks. At that time I discovered that the weatherstripping was hanging the sunroof - so uptil the time I get a new one - the sunroof is remaining closed.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)