In addition to last post.
I changed the primary graphics from the intell 9770 chip set internal graphics 
to a
Asus Geforce GTX 1660 super and still have the issue.
It appears to have taken longer to happen though - when the screens went into 
power save mode automatically - the borders appeared on reactivation

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https://bugs.launchpad.net/bugs/1873497

Title:
  Ugly display in Ubuntu-DDE

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