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Hi there, its a common problem, but not specific to any brand/model (I had a similar issue with my Scorpio). Its really just a build-up of muck from Autumn & Winter which has accumulated, plus the runners which the sunroof slides on may have some corrosion on them.
It is important not to try and force the motor, as you may cause it to burn out.
What I did was whilst the panel was in the tilted position, I stood on the sill and applied some LM Grease to the runners and as far back as I could reach, I also coated the seals in case they were dragging. I then patiently wound the roof back and forwards until it eventually had full movement. I spent around half an hour doing this, reapplying the grease every so often.
As you will (hopefully) have gleaned from the above - patience and mechanical sympathy is the key to success.
All the best,
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater