Evidently the rusting and flaking of paint off your Traeger is not unusual. My Traeger is over three years old and is experiencing the same flaking and rusting as mentioned in the threads above - both inside and outside on the lid and body. I contacted Traeger and sent pictures. Their response was that it was out of warranty and there was little they could do. They said I could buy their paint and repaint it but they did not have paint for the top so I could order a new one from them. Did not offer to send paint or anything. Very disappointed and can no longer recommend this brand - simply too expensive for something that is going to rust out in a few years.
There are other options out there. There is a "traeger" look alike made in the USA of heavy duty materials. Believe they are made in Arkansas. I will search for one of those to replace my rusted out $1,000 Traeger.