Mista, do you use charcoal or lump. At the 9.5 hour mark, my temps just plummeted. I was cruising along at 235 then it dropped to 218 then 208 then 195 all within about 5 minutes.
The ash was choking out the fire. I had to take out the food and clean off the coals and it climbed back up to 230 pretty quickly. I was using Royal Oak.
I was thinking about using some lump, but all that is available here is Cowboy and mesquite lump. And personally, I dont like mesquite. I know you and others do.
Wannabe BBQ Illuminati