I've had my char griller now for a year... I have the offset fire box. Here is my problem inside my grill on the lid and the side walls I've noticed bubbling and flaking... everytime I've grilled this season (which is when it appeared) I've scrapped more and more off before the que. It looks to me like metal or paint its reflective which is what makes me believe that... but inside the firebox I have nothing of the sort going on. I have recently had another issue it seems as though I can not get my CG hot enough no matter how much lump I have in there. I added Ceramic bricks to line the bottom to better distribute the heat could that possibly be it?