Not uncommon. I am on my third motor in two years.
Another person whent through 4 motors in one summer season alone.
Ford and Webasto are aware of the problem. Most likely the roof was stuck in the vent position.
The cables are in a bind in this position and strain the motor to close it. Eventually the windings will overheat, for lack of a better turn. This condition occurs most often in the summer season. I have been able to get it to close after sitting all night. It will then open up once more, and get stuck.
Last time I checked, the motors are around $300 from Ford, and they bought all of the technology rights from Webasto, which means we're stuck with dealership prices.
This particular model is still being produced for the Jag X-Type and the Mondeo's, but Webasto had no plans of a redesign, as of January.
Regards,
David