I have a new (to me, bought used) Osburn LA30 stove. Most of the time it works great, but twice now I've had a problem: Normally, when it shuts off I hear the wall thermostat click, the flames stop with maybe a few residual flickers, then there's a final "poof" or "whump" (just like my gas grill) and that's it. Also normally, the pilot is a clean looking blue flame, showing as three distinct jets around the thermopile. Twice now, however (I only observed it once), when it shut down the flames flickered around for quite a bit longer, and when I went over to watch it, there were weak yellow flames coming out of the pilot. It made the final "whump" late, and then the weak pilot just sort of faded away (not enough heat to the thermopile, presumably, so it shut it down). I was able to relight it immediately and it then looked normal and worked correctly. This happened right after the gas company filled my propane tank (previously I had drifted a few 20# bottles into the tank myself to check the operation). Can't see how that would affect anything, but I mention it for completeness. I'm guessing maybe some crud somewhere (this is a new installation, after all) but I'm open to ideas. The fact that it's an intermittent problem and relights immediately is weird, though.