Tell me you didn't have to finish a forge weld in a vise without telling me. That sounds like a special kind of long night. Honestly, I'd be looking at the gas jet and mixer tube first, they love to clog up right when you need them most. A lot of the fancy designs fail because they're too clever by half. My old straight pipe burner with a good needle valve has never left me hanging, even if it sounds like a jet engine. Sometimes the simple fix is just cleaning the thing you already have.