I have 3 rigs on Asrock h110 BTC+ nvidia based (1070 + 1060) on different PSU's and connected to different routers. All of them has very unpleasant problem: once or twice or thrice per day the system hangs and hangs the entire network. This happens only on nvOC, on smos or on ubuntu 16.04 - ok about 2 days. Tried: disable (and remove) dhcp, another router, disable network manager, usb-lan but problem still here. Any thoughts?
You say "the system hangs and hangs the entire network" yet you also say you have 3 rigs. Do you have any idea which system is responsible for a particular "hang"? Also, how do you fix the hang? You also mention disabling usb-lan so how are the rigs connected to the network - wired, wireless, or?
You may want to look for errors/issues in in each rigs /var/log/syslog.
Rigs are in different places but with the same symptoms. Connected by wire. Hangs only can be fixed by reset button or power switch.