To debug this issue requires more information, the log messages from
avahi itself are simply a "symptom" of the fact the network address was
deleted.

For any affected system we need to know
 (1) How your network is setup, e.g. /etc/network/interfaces, Network-Manager, 
etc.  Plus a copy of the relevant configuration file.
 (2) A full copy of the syslog file when the issue occurred including at least 
a few hours before the issue.  There may be some other log items such as 
related to DHCP etc.  If you reboot, the logs may get rotated to 
/var/log/syslog.1
 (3) It would be helpful to know that if you attempt to reconfigure the 
network, does it then work.  e.g. if you do ifdown, then ifup.  Or try a manual 
"dhclient eth0" (or whatever the interface name is)

I am imagining two main scenarios here, either
  (a) You are using DHCP and the DHCP lease fails for some reason causing it to 
be removed from the interface.  Perhaps dhclient fails, or the DHCP server is 
temporarily unavailable. Hopefully syslog might have some info there.

  (b) The network card itself stops passing traffic due to a driver
bug.. given everyone is reporting issues on realtek this doesn't seem
unlikely.  To narrow that down we really need someone to try re-
configure the IP, try adding an IP manually/statically and then running
tcpdump to see if any traffic is hitting the machine.  You could also
try perhaps remove the kernel module and insert it again.

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

Title:
  Avahi-daemon withdraws address record

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