Hello guys.. Im new in this hobby and i have this mining  pc:

Asrock H81pro btc
6x gtx 1060 6gb
4gb ram
intel celeron 2.8GHz
1x ssd 60gb
corsair HX1200i
Windows 10 Home

i run the ethminer 0.12.0 and my problem is when i run for 3-4 hours one of gpu crash and run only 5 gpus. Or crash all pc and i cant do it nothing. Only to close from power and i restart again.. msi after burner defualt settings.. Only power at 75%...  i have change many of settings from msi but nothing..