Can anyone tell me about a known fault with the 4motion manual gearbox?

Apparently there is a plastic cowling inside the gearbox that somehow gets caught up with the bearings, then sends the bearings through the side of the case if the car is driven further.

I was driving home from work and in 4th and 6th it suddenly happened. A noise not unlike that of the plastic strips that kids put in the spokes of their bikes.

It was parked on the drive and that is where it is going to stay.

Does anyone recommend or know of a reputable gear box place in the Wrexham area?

All i seem to be doing with this car is getting it fixed. It has done only 80,000 miles with full history from VW. Is mine the only one that seems to have problem after problem after problem?