If i have my Display at 240hz, I will just get random "signal losses". Meaning my screen turns black for a second or two.
I don't have this problem with any other game so i guess its related to the game in some way.
Drivers are up to date. GPU Stresstests give no issues. Only fix is lowering the refresh rate.
Display is 5120x1440, 32:9.
I did not tried to disable G-SYNC.