After I shut down the engines and restart them in the 777-200, the Navigation Display (ND) does not function properly, and I lose Autopilot (auto flight) functionality. I perused the internet and manuals but can not find a solution. I suspect something electrical, some buttons I need to press maybe? I hope its not the product itself.

Shutting down and restarting the engines in the 777-300ER does not negatively effect the ND and Autopilot (so far). They function normally before and after.