Occasionally losing wired LAN connection on Ubuntu 16.04
This is most likely an issue with avahi daemon and more than likely with .local domain.
Follow those steps in that order, one at the time:
- change your domain from .local to FQDN
- disable avahi from seeing this interface.
- disable IPv6 if you don't use it
- disable/remove avahi daemon if you don't need it ( I would start with this as you probably have no need for avahi anyway)