[SOLVED] OpenVPN service causes Kodi to stop

[snarf]

Hi, hopefully someone has seen this before and I'm just missing something obvious...

Software
XBian version: 20150919-1 (updated 2015-10-3)
XBMC/Kodi version: 15.2-RC2 Git:2015-09-13-2d0c3cf
Overclock settings: Default (off?)

Hardware
Device type and model: Raspberry Pi Model B 512 MB
Power supply rating: 1.2A
SD card size and make/type: Sandisk 16GB class 6
Network: Ethernet
Connected devices (TV, USB, network storage, ...): None / headless

Log files
Link to logfile(s): kodi.log

Problem description:
Installing and running OpenVPN package causes Kodi to be non-functioning. Stopping the VPN service allows Kodi to be restarted but it fails again as soon as OpenVPN is started again.

I'm struggling to find anything in the logfile that highlights a conflict and the upstart log isn't helpful either.

How to reproduce:
Vanilla build of Xbian.
Add "tun" to /etc/modules (or modules.xbian)
apt-get install openvpn (tested with 2.3.4-5 from Jessie and 2.3.7-2 from Stretch)
Copy appropriate .conf, .crt and .pem files to /etc/openvpn
Either service openvpn start or openvpn path/to/profile.conf to start vpn.
Kodi stops. Will not restart until vpn is taken down.

Reboot - same thing - Kodi down until openvpn service stopped.

Edit: forgot to include that I mounted an NFS share from my Synology NAS to copy the files from. xxx.xxx.xxx.xxx:/volume1/downloads /mnt/downloads nfs rw,defaults,intr,vers=3 0 0 added to /etc/fstab