Up to this point the EFIS 5400 has worked fine. A couple days ago while on a long cross country the screen went dark for 20 seconds and then come back on. The system has an AIRINC to the TRUTRAK autopilot and the autopilot did not trip off so a complete power failure isn't the problem I don't think. Suspect dimmer, maybe. If over heat should get other messages.
Ideas?