Ok so I'm running three monitors on a Radeon 6670, I used this for almost a year now and no problems I recently re did my desk, the monitor will just turn off randomly like won't be detected, (no signal) and it's plugged in via VGA to display port splitter, then into my gpu, when it does no input I usually just unplug it and it's okay for a few minutes, but it never used to do that before, anyone may know of a solution?
Sounds like the display port splitter acting up, I had bad experience with those. Skip the port splitter and connect to PC directly, see if that works.