This has happened to me twice now. I power on the RT-700 and it doesn't light. After about 5 minutes and this last time turning the temp to 450 the unit ignites and blows the lid open. When it did it this morning I was in the house and the explosion was so loud I thought a transformer blew up somewhere. Then I realized it was my smoker. Anyone have this happen? I always reduce my temp to low and leave it sit there for 15 minutes before powering off the unit. I allow the unit to complete it's shutdown process before unplugging it. Kinda scary!!