ION XE monitor dropping out

Hi folks,

I have an ION XE 20 with two ViewSonic touchscreen monitors which have been running fine for a year or so until a few weeks ago when one monitor drops out. It usually happens a few seconds after fully booting up and I can unplug the display port, wait a few seconds, plug in again and it's usually stable until the next boot up. It's not a huge issue, just irritating! Software is up to date.

Any thoughts please? Thanks in advance!

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