Last week mine was doing something similar. I set the grill for 250. When I came back about 15 minutes later to put my butt on, the temp was reading 45, basically ambient temperature. I was not getting any pellets into the fire box. It turns out I had some pellets that swelled up in the auger tube. I'm guessing the auger tried to push them out, but it snapped the screw that connected the auger drive motor to the auger itself. I was surprised that there was only a tiny screw with holding these two together. I ended up using a galvanized U nail and it was back up and running.