I had the same problem with a new tank once, all I did was unhook the propane tank and re-attach it. I can't remember who told me, Jed maybe, but apparently there is a ball that if not aligned correctly when you hook up a new tank, can stick and cause the breathing flame. It worked for me, so it might be worth a try. I also run my propane at around 12-14, especially when the temps start to drop.
Edie
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