So I recently changed temp probe and igniter. Still having same problem. After I changed igniter I started the grill on smoke. It got up to temp when then I increased temp to 450. After cooking for about a half hour the temperature started flashing 90, then 100 then jump back to original temp then stayed at 90. During this flashing the auger still continued to feed the fire. Which I assume is happening because the temp flashing 90 its tell grill to raise the temp at which point its just getting hotter and hotter. Like I said I already changed internal temp probe a month ago and changed igniter today. Grill was working fine until cooking for a half hour or so. Lost at this point....any thoughts?