My setup:

i5-4670k
GTX 1080 SLI
16 GB DDR3 RAM
Acer XB280HK 4k Monitor
Dx11 Version Full Screen

Problem: When I do certain things like call my retainer, the signal will be lost from the video card and my monitor will go black and say "No Signal." I can alt+tab out and the signal comes back with my desktop partially in view and the ffxiv window visible. If I click on it I can go back to playing normally, but if I call another retainer this will happen again (Dismissing the retainer doesn't do it).

It only affects certain things consistently during a log-in session. Right now I can call my retainers fine, but when the circle holding the players from engaging in an instance while someone is in cutscene disappears, it happens. It's mostly the circle or a change in instance status like when transitioning into the end of a fight when the chests pop.

I've done clean install of the newest graphics drivers, checked the temps and fan speeds on my video cards, and ran Heaven Benchmark to make sure my cards are working fine. Any help would be appreciated.