Interference from a lighter with electric igniter. Either that or maybe the monitor has some sort of ambient light sensor?
Weird! Going to try it on the PG348Q tonight when I get home from work.
Nothing wrong with it, just thought I would share - I've never seen interference like that before
So I've been having issues with these monitors for a few weeks (since even before the lighter discovery) and it has gotten much worse. TURNS OUT IT IS NOT THE MONITOR.
I've been experiencing "No Signal" errors, flickering, vertical artifacting/blurring (hard to describe what is looks like - white vertical lines and double image), system freezes and crashes!
After lots of troubleshooting, one day my phone was under my monitor laying on the (aftermarket) display port cable. My phone rang and the computer crashed.
Turns out that the Cable Matters "Display Port" cable was causing all of these issues. I found someone else on Amazon's reviews who had the same exact problem. Unfortunately because I'm using three of these monitors the included cables are not long enough.
Swapped cables and haven't had a problem since.
Hope this helps someone.
Edited by OverK1LL - 7/8/16 at 1:33pm