Avionics problem

Hi, my friend have a problem with all avionics.
He plays Xbox. When he go to place where are a lot of players his screens go Black and all avionics doesn’t work. When he goes to empty airport or to offline mode everything works corectly. What should he do?
Also he bought Dc6 and when he wants to land his plane was going mach7 and then couldn’t go back

He mosty flyed airlines but it happens on other planes too

We’ve moved your topic into Aircraft & Systems

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