I have noticed that my smoker (PB850PS2) can and will get up to my temperature setting in a reasonable time when I set it above 300. This weekend I set it for 250, my smoker took an hour to get up to 225. This is less than a year old and I recently cleaned. I set the smoker to 270 and it reached temp in 15 minutes then brought it back down to 250. Anything I should be looking at?