When I was pre-heating my Q320 today I heard a loud pop or bang sound inside the grill, so I opened the lid and saw to my horror that the cast iron grate had cracked. It was in that solid ring of iron that follows the outline of the outside burner. So I called Weber CS, and they are shipping me a new grate (actually they are sending me both grates even though only one is broken) free of charge. You have to love a company that stands by their products.