I have an 18.5 wsm. I got a bbq iq 120 recently. I thought the first few times I used it it worked fine. But now I cannot get the cooker to regulate at 225. I keeps spiking up to 260 and higher. I can't get it even below 260. I cook wings at 250 and I can't even get it there. I have done two ribs cooks and it spikes even up over 270. So I did not have a good finished product each time. I have all the bottom vents closed. I even closed the top vent fully and it still was really high. I am using kingsford professional. I do minion and start with about 6 coals. I changed the setting to 1 2 0 and 3 and nothing changes. Are the hotter burning kingsford professionals the problem? At first I thought it was the heat when it was over 100 for a while here. But not it's cooler and two more cooks same thing. Do i have a leak in the cooker you think? Should I tape up or get something for the door? I don't see any smoke coming out of it. Or is bmy iq 120 defective and I need to ask for a replacement? I used the 110 for about two years with no issues but then thought I would upgrade.