This is probably a cable or dock problem like
https://discourse.ubuntu.com/t/the-display-bug-we-cant-fix/57434
But in case there is any explanation in the logs, please run this next
time it happens:
journalctl -b0 > journal.txt
and attach the resulting text file here.
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2152536
Title:
Second display keeps going blank
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