This has been an issue for a few people on XBox on a few threads now. It relates to long flight times say 2+hrs. Just search the forum for ‘black screens’, seems like it’s a bug.
The max flight duration I do rigth now has been 1.5hrs and I haven’t seen this. Just about everyone else seems to get it on 2hr+ flights. Stick to shorter flights until the issue is resolved or try using the 2hr workaround (for CTD’s) and see it it takes care of your screen issue.
"Downloading ~25 GB of content and entering a flight durations of 2+ hours may cause a crash or service disconnection issue
Workaround:
On Xbox: press the Xbox (jewel) button on the console face once, which places the console into connected standby mode. Then, press it again to wake it back up. "
from M/S FS2020 known issues page.
Other thread on this forum is here-