We were starting to have similar problems on Dell Optiplex 380 after upgrading screens to 4k. But in our case it was not only NAV, Outlook was causing similar issue when run in realtively big window. When you opened it small all was fine, when one started to drag the corner to make Outlookl window bigger the screen went off. Come back (blindly ) to smaller size and the screen was back on...
Dropping the screen refresh rate to 59Hz helped a bit.
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Dropping the screen refresh rate to 59Hz helped a bit.
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