Went though the usual routine this morning, got good secondaries for a half hour, stove goes black, see some flickering light but no flame in the box, look up at the screen and above the screen I was getting massive secondary burn, about a half hour of that and now the secondaries are back in the box. Anyone seen this yet and I was wondering about flame impingement on the cat, ceramic cat may not work in this environment, if they ever come out with one