Glad to hear it’s not just me. New RT Stampede and I’m also having same issues, and in AZ.Hello All,
I just found this post and wanted to chime in as I'm having the same problem maintaining low temps. I have the stampede (RT580), its only 3 months old and I've cooked about 8 things on 225ish, including long cooks like pork shoulder and recently a beef brisket. The first few times it was flawless at holding temp. The last 3 or 4 it starts out great, stays at the temp until I open the lid to mop or baste a few hours in, then it goes up at least 50-60 degrees after I close the lid and stays there. In one instance (see photo) it shot up to 345 with a 225 setting!! The last time I tested it and it stayed up there for over an hour. Even when I lower the grill temp it doesn't come down, so I find myself having to turn off the grill for 30 mins... for the brisket I had to shut it off at least 5 times!! I've reached out to RT but have heard nothing yet (in fairness I just called and left a VM today, however didn't get a response from my feedback submittal last week).
Important to note I live in Arizona, so obviously outside temps could be a problem, but was told that is what sets the RT's apart, that they are built to counter outside elements. My friend down the street has an newer Traeger and it holds temps just fine. Thanks for any input...
Frustrated in AZ!