Hey all, so I have had my pro series 820 for about a year now. Everything has been working fine until now. I clean my firebox often, after a few times. But now I will put in smoke setting and and it seems it will only go up to 160 on P4 settings but will fluctuate, go down to 130 then start flashing and then smoke will start billowing (white smoke). So today I took out the grates cleaned my temp probes and and just watched it and everything seemed to work just fine. Put it all together and let it get up to temp. Had it on P4 smoke setting (mine gets up to about 185 on p4). Threw the turkey on and low and behold same issues. Can someone explain. Not sure what the deal is. Seems like I'm not getting enough oxygen to my firebox. Don't know im lost. Thanks ahead of time.