I have an Osburn LA30 gas stove. Lately the pilot goes out intermittently. It lights fine, and stays lit, then some time later I notice that it's gone out. It always relights just fine, and the main burner ignites when the thermostat calls for heat... if the pilot is still burning. When the main burner shuts off, there is a momentary flickering of flame, then there's always a final "POOF". Every time I check the pilot right after that it's still burning, but that doesn't mean the poof doesn't blow it out occasionally. I did recently add a second [used] propane tank so I might suspect some air in the lines, but the main burner has been run long enough that I would think any air would be purged out by now. The pilot flame looks like it's large enough, and properly impinging on the thermocouple and thermopile. To be sure, I cleaned it tonight, but I don't see any difference. Hasn't gone out yet but that doesn't mean anything. It doesn't happen just on windy days so I doubt it's a draft issue.