Ethernet Ports shutting down after a few minutes of connecting more than one device

I have a Nighthawk AC1900 (C7000) DOCSIS 3.0 Ethernet Ports work with one device connected. If I attach a second device, It will only wok for a short period of time (5 Min +-) then shuts down all ports. I've tried this multiple time with different devices and the same thing every time. I'm running all Mac's 10.12.6 (Sierra) and the Nighthawk seems to be on the latest firmware as I don't see any firmware downloads for this model available. Its has been doing this since I purchased the unit, just under a year ago, so I'd like to get this resolved before the warranty runs out anyway. Any Ideas?