Quote:

the problem that you have like me disapered as for magick or you solved it with the solutions you sugest?

I don't know what I did to make it disappear.

Originally, I used the electric_always_available=1, to stop it happening.
Next. I used CTRL+SHIFT+A to turn the avionics back on when they turned off.
Then I used FSUIPC to Extend battery life (indefinitely if value equals 0, else by factor), by setting the value to 0.

One other thing I used to do to get the avionics back and working, was to press CTRL+E, the default for engine start, because it turned the avionics back on and they never disappeared again during the flight. This did not cause the engines to be shut down and then restart either, it only turned the avionics back on. So it was another work-around.

All of these worked as a way of getting around the avionics turning OFF after about 10 to 15 minutes. I do not use any of these fixes any more. A few weeks after I asked Lou those questions, and got his reply, everything was working like it should. I honestly think I was missing something that eventually allowed the avionics to turn OFF after 10 or 15 minutes, but to this day, I don't know what I was missing that caused it.