Game freezes reboot required

I had this problem since day 1, this is my actual configuration.

R9 290X Crossfire watercooled, stock frequencies.
I7 3770K watercooled, 4.5GHz.
32GB Ram 1600MHz watercooled, stock frequencies.
3xAsus 27" 2560x1440, total resolution 7680x1440.
Temps are under control, voltages the same.

Randomly the game freezes, the music continues to play in background and i am forced to brutally shutdown the pc since the keyboard wont work to go back to desktop.

It's incredibly frustrating, when it happens in dungeons i waited 1 hour in queue for i would like to scream because most of the times you get replaced before you can restart pc, open ff14 again and log in.

The problem is related to crossfire, if i disable it then the game runs flawlessly with no crash at all.

Also I have to manually set the crossfire mode using the FEAR preset, otherwise the game lags and stutters as hell.

I tried playing at 2560x1440 but all my elements of the GUI are set to 7680x1440 and I just cant play with a lower resolution.

From today i am playing with a single card instead of using crossfire but my FPS drop to 31/34 and less, making the experience a bit laggy.

I tried AMD 14.6, 14.7, 14.8, nothing changes.

Anyone has a solution? This is ridiculous.