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About a month ago, I started having a problem where staticy horizontal lines gash across both monitors seemingly at random (although usually worse when the video card is working harder) and cause the screen to flicker momentarily. Example: http://i.imgur.com/P7BKlhv.gif (Sorry for the quality - video was clipped to protect the privacy of people.) The lines appear across both monitors in the same exact place at the same time. They don't appear in desktop recordings/screenshots/etc. (Pic related is not my actual computer)

I've reseated the GPU, all cables, dusted my computer, made sure nothing was overheating, made sure both monitors have the same refresh rate, did clean installs of the GPU drivers and software, updated my mobo's BIOS, and even replaced the GPU. The problem only occurs when both monitors are plugged into the GPU and are both being used. (Setting my projection mode to PC screen only or Second screen only makes the issue go away, also having one monitor plugged into my integrated GPU and the other into my discrete GPU resolves the issue.) When this started, I occasionally got a blue screen error "thread stuck in device driver". (Just got my replacement GPU yesterday, haven't had a blue screen yet.)

My only ideas are electrical feedback (as many connected components of my PC are plugged into separate outlets) or software/firmware conflicts. I doubt it's electrical feedback because I didn't have the issue with months of frequent use and it suddenly happened out of the blue one day. Not to mention if the blue screen error is related, that makes it highly unlikely

Specs:
Win10 x64
i5 4690k
R9 290 (monitors connected via DVI cables)
8GB DDR3 RAM
MSI Z97 PC Mate