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Starting on page 15 are the directions for the monitor controls. Page 17 indicates a "RESET" feture to Clear the Old-Statuses of "Auto-Configuration". There are quite a number of setting for this monitor.
An unusual problem for a flat screen monitor.
I suggest you connect the monitor to another PC to see if the problem persists since it could also be caused by the video card (or circuit, if on board).
Check your cables making sure they are solidly connected and wiggle them to see if you can cause the problem to come or go away; this would crudely check the shielding of them.
This kind of aberration could easily happen with a conventional CRT monitor if power supply filtering was failing but as mentioned, uncommon in a monitor that is essentially digital.