Same symptoms, same result on a headless always-on box running 16.04.
Made worse by the fact that I have to hard-power off the box and hook it
up to monitor for troubleshooting.  Every couple weeks the machine will
lose connection to the network.

Last time I thought I lost the on-board NIC and went and
bought/installed a new NIC card  (another Realtek).  Two weeks later,
same result:  syslog shows this:

May 24 22:40:14 phaedrus avahi-daemon[857]: Withdrawing address record for 
192.168.0.201 on enp4s1.
May 24 22:40:14 phaedrus avahi-daemon[857]: Leaving mDNS multicast group on 
interface enp4s1.IPv4 with address 192.168.0.201.
May 24 22:40:14 phaedrus avahi-daemon[857]: Interface enp4s1.IPv4 no longer 
relevant for mDNS.

## System:

Host: phaedrus Kernel: 4.4.0-78-generic x86_64 (64 bit) Console: tty 9 Distro: 
Ubuntu 16.04 xenial
        
## Network: (from `inxi -F`)

Card-1: Device 000c:d051
IF: N/A state: N/A speed: N/A duplex: N/A mac: N/A
Card-2: Realtek RTL8169 PCI Gigabit Ethernet Controller driver: r8169
IF: enp4s1 state: up speed: 1000 Mbps duplex: full mac: 00:0a:cd:2c:93:5f

Looks like it might be Realtek 8168/9 related?

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https://bugs.launchpad.net/bugs/1586528

Title:
  Avahi-daemon withdraws address record

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