Yes I had an old Genesis gold do that. That's what led me to get two kettles. Anyway...
Burner tubes crowded over the years and loosened up just enough to allow the end where they go into the manifold to slip away just enough to allow gas to leak out and catch fire. I lit it up to preheat so I can clean the grates before cooking. About 10 minutes later went out to check on it and two of the three knobs were just a puddle of plastic and on fire.
That grill was pretty old and so I retired it. LOL
I know now that I could have replaced the burner tubes, manifold assembly and knobs and still be using it. But there were other problems with corrosion and rust that it just wasn't worth it to me.
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