I'm having a problem with my Harman P-61. Pellets feed normally through the auger until we get a nice burning full-blown flame. Then, for reasons I hope forum users will recognize, the pellets stop feeding until the flame backs down all the way back to the auger. During this dieback, the feed motor light comes on regularly but the motor itself does not. The status light stays on constant, not blinking to show there is an error somewhere. Once the flame gets all the way back to the auger, the feed motor starts working and builds up a nice flame and the cycle starts over. I'm suspecting that it's a draft problem, but the Harman website only has manuals for the P-61A, which has a set screw on the control board to adjust draft. The P-61 does not. The gaskets on both the glass door and the hopper lid seem to be fine. Does anybody have a suggestion? Thanks!