I've only had my large BGE for a few days, and the daisy wheel has fallen off three times already when I've opened the lid. I've searched this forum and it seems like nobody else has this problem. Could I have assembled something incorrectly? Could I have been supplied with wrong part? Is the XL daisy wheel larger? It won't fall off if I open slowly, but sooner or later it's bound to happen again and put yet another big divot in my deck. Any ideas?