Wish I had read these posts before buying. My smoker had great temperature the first few times I used it, it was around 225 on low and over 400 on high. Now on high it will barely get to 225 on preheat. I've cleaned the venture and I even use a propane bottle with the old style valve. Is it possible to have a blockage in the orifice? I really don't want to disassemble everything for no reason. This is a Masterbuilt dual door vertical gas smoker.