Winnebago roof blows off

I have direct knowledge of two Winnies having this roof issue a 2003 Brave and a 2007 Voyage- a friends and my own! Their roof separated while driving. They taped it down and limped in for a full repair. 2007 problem was discovered during a roof inspection to recaulk any issues. Well, the driver's side roof was pulling away for about 1/6 the length of the coach. Winnebago warrantees the roof materials only even though I had paperwork proving regular inspections/repair well under their 10 year warranty. Repair was made at my expense. Long term extended warranty did not cover the roof either, which I knew going in. Moved on from Winnebago now. Guess we'll see if any better.