I originally setup my server just after christmas last year. I had been running for months without issue. Lately I have had the server drop completely off the network twice. The router no longer sees the server, nor docker containers with other assigned ip addresses. I typically run the server headless, but the first time it happened I hooked up a monitor and keyboard, but nothing was visible. I do not have a discrete video card, only Intel HD Graphics 4000 on my i3-3225. Unfortunately I've been out of town both times it has happened, so I've only come across it hours after the fact when I come home. I've attached two diagnostic zips from when it has happened. Looking forward to any help I may receive. Thanks in advance.
tardis-diagnostics-20180523-1029.zip
tardis-diagnostics-20180527-1931.zip