Well, having NOT flown 04H to Columbus, someone else snagged it for a flight to Chicago and, yup, reported a complete avionics failure on short final at CMI. The same pilot, too. I'm suspecting either a pilot problem or a heat problem, but supposedly they tested that in Bloomington. I am just going to have to take her up on a long flight and see. Certainly everything behaved perfectly on the 0.5 hour flight home. What's irritating is I had a good shot at seeing this first hand, had I only decided to turn back and fly instead of proceeding by car on Sunday.