What causes exhaust manifold bolts to break? on 2008 Ford F-150

Does a warped exhaust manifold cause the bolts to break or does the bolts breaking cause the manifold to warp? We are have an issue with the warranty department.

Asked by for the 2008 Ford F-150
Defective materials or improper assembly.
Wonder what motor this thing has?
It's a gasoline/green jelly hybrid I believe.......never mind....
1 more answer
repeated heating and cooling