Brewed something yesterday I've never tried before doing an AG Milkshake IPA. I hit my normal 70% efficiency numbers spot-on and the brew day went pretty smooth except for one little snafu. During the boil I stepped away for about 10 minutes and came back to find the flame was out. The wort temp was down to about 190 after boiling for 20 minutes. Temp outside was pretty cold at 35 in Wisconsin. There wasn't much wind, so I don't think that caused the flameout. When I tried turning off the propane tank and turning it back on, there was nothing. I swapped out with another tank I had and still couldn't get any flame or hear any propane coming out of the burner. I was thinking maybe the flame setting red dial was broken or malfunctioning, but not entirely sure. Eventually after much fiddling around, suddenly it started working. I did panic a bit when this was happening because I don't have a secondary burner and was quite relieved when magically it starting working again. However I'd prefer that this doesn't happen again and wondering if anyone has any ideas what may have caused this? This burner is a few years old and still in good shape, but I haven't done any maintenance to it and not sure if I should be doing something to keep it working well?