I feel your pain, having suffered the same issue just a few seconds ago.
Although there's a chance we're seeing the same symptoms with different
root causes so please be sure to open your own bug by running:
ubuntu-bug linux
Start by testing different display cables/connection types.
** Changed in: mutter (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1929209
Title:
[i915] external monitor goes black for several seconds at a time,
randomly
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