Fresh Install keeps going to "Sleep"

[JDLang76]

I've used TrueNAS for tons of networks as a simple NAS, but have never hit this issue before. I fresh installed on a custom built box using a modern Gigabyte board (what I always use) with 1gbe ethernet. The network is Ubiquiti. About 10-30 minutes after starting the TrueNAS box, the monitor goes blank and the server disconnects from the Ubiquiti network. I can't imagine it has some kind of sleep mode, so to be honest, I'm really too sure where to start with troubleshooting because I've never run into problems with it before. Any starting point would be very helpful as this is for a customer.