My Traeger pellet grill scares me after this,

Today I was smoking a pork roast on 180 deg for a couple of hours. All of a sudden smoke started pouring out of the grill and pellet box. The pellet box got so hot you could not touch it and the temp gauge went to over 400 deg. It made a poping sound and the lid flew open like there was a small explosion in it. The grill is only 9 months old and I only use Traeger hickory pellets in it. About 20 minutes later it went back to operating normally. My wife and I are scared to use it again as it seems like a fire hazard. The pork roast survived, but it was too smokey tasting and ruined.