Recently, Larry Dighera posted:

GARMIN G1000 PROBLEM AFFECTS GA DELIVERIES
(http://www.avweb.com/eletter/archive...ll.html#195931)

The situation is quite unfortunate, but perhaps the "known defect" comment
and that units installed earlier at Cessna don't fail in some predictable
way indicate that the problem has been identified. Sounds to me like a
component issue rather than a design issue, and if so, should be resolved
fairly quickly.

Neil