I have Sapphire Radeon 7850.
Recently bought a 4k monitor (Acer CB281HK) - connected via Displayport.
I experience random short screen flashing (for half second maybe less) when using desktop (not when playing games).
Sometimes it doesn't happen for couple hours, sometimes every 5 minutes.
It's very similar to problem described in this old thread : R9 390 Multiple Screen Flickering Bug : too hard for you to fix it AMD ?
Although it is described there as screen flickering rather than screen flashing, but i think it's the same problem, because solution is the same.
It must be something with memory changing frequency, because when i cap memory frequency on my GPU on 1250 Mhz (using Asus GPU Tweaker II) problem disappears.
I also use Displayport as people in that thread.
It has been 2 years, how is that possible this problem is not fixed yet ?