Since the update to 2.19-5 my NSA310 did not setup the enp1s0 ethernet card anymore. During boot I could see that systemd tries to setup eth0, but this is renamed by systemd itself to enp1s0.. Weird.
I am using systemd-networkd. Resolved this by reverting back to 2.18.
In my opinion, these are also results of this bug:
viewtopic.php?f=60&t=8756
viewtopic.php?f=60&t=8024 (post as regards odroid u2)