I wouldn't actually call myself a Traeger 'hater', I own three Traegers. But then , other then the actual joy I've had to be able to cook with pellets on my first pellet grill, the Traeger Junior, I can't really say much good about them. Well, that's not entirely true... I've never had hard fast failures, even after basically severely neglecting mine and then turning them on to figure out they still actually work.
The bad is, I've never had a Traeger that I really love... The temperature holding ability is really bad on all three I own. Yeah, I can cook on all three of them, but not nearly as confident in any of the three as I am with my Fast Eddy, or even with the Rec Tec Stampede I own.
To see that Traeger switched to a new style controller had me very optimistic that they could put most of their temperature control issues to bed... But based on this report, I would say they apparently missed their chance to actually get things right. Maybe your's is a one off issue, but I somehow doubt it.