Full screen crash/reboot

When I play full screen previews on a big monitor (3440x1440) my system crashes and reboots, specially if it’s playing a heavy file.
I use a dual Xeon 96 GB RAM and GTX 1080 2 outputs 2560x1440 + 3440x1440
Nvidia driver v
Notch Pro v
Please advise

sorry, driver is 368.25-desktop-win10-64bit-international-whql


Good talking on the phone. Let us all know how you got on with the suggested points:
[ol]Removing old NVidia 730 card from the machine
Updating drivers
Using scaled resolution when going fullscreen[/ol]