The flame on my xxv seems to be a bit lazy on the left side. I just cleaned the stove because it didn't seem to be running normally ( well the way it's run all year). After start up the flame was licking around the bottom of the burner on the left side. The glass was stained on that side right after start up as well,it's the first time that's ever happened. Any advice greatly appreciated. Hope anyone with more knowledge than me can make some sence of my post.