Eric, I’m sorry for the trouble you’ve had with your Traeger. Not sure this will help, but here is how I make sure I don’t have the problem you had. When I start after a long previous cook or any cook at all really, I vacuum out all the dust and vacuum out the burn pot. Then, I put a handful of pellets into the burnt pot, insert the heat deflector, the drip tray, and grate. I find that this keeps things working well. Sometimes, the burn pot will get too full of ash and this can cause the problems that you had. Give it a try. If it works, please let me know.
Although these are marketed as grills, they do much more, including baking or roasting. Because they heat by convection, you might not get the grill marks that a gas or charcoal grill will give you, but you also won’t have the flame-up problems. While many pellet grills offer high cooking temperatures, the maximum depends on ambient temperature and wind. Many users wrap their grills in special insulating covers to help maintain heat, reduce fuel use, and reach the higher temperatures they desire.