This is the second pork butt I have cooked. It is going well and the temp held through the night last night. The only problem is my polder is not giving me accurate readings. I know the polder is good and the batteries are fresh so that is not the problem. I have moved it a couple of times. Right now after 12 hours it says the meat is 300 degrees. Not true. The but weights 11.5 lbs so I know it has to cook at least 18-20 hours. Any suggestions????