I have been having issues with my Lexington holding 250*. It will hold 300* dead on. 250* it fluctuates, but stays under 250*. It will be at like 210-230. I do not have a blanket and my last cook it was about 40* outside. During that cook I had to run it at 300* for about a hour, which it held steady the whole time. Once I turned it down to 250*, it was all over the place.