I own a Pitboss classic. After a year and a half started to get run away, temps. Not all the time but also had a huge temp swing of up to 50 degrees as well. So I purchased a PID Control modified my hopper to fit the new board, upgrade the burn pot and new glow rod, and new temp sensor. After installing the new control still ran away, called the company (leaving the name out of it for now) they suggested I install a chimney and a heat diffuser. Easy enough, made no impact. So mailed the controler back for an update, no impact. Board number 3 no impact. So I am set to return the controller and I ordered a factory replacement, no impact. Still running away . So I am kind of at a loss of what could be causing this. I have other smokers I can use so thinking I should forget pellet grills, but when it worked I really enjoyed the ease of it vs my barrel or smokehouse. Any ideas tips trick ect please?