Update fails on NFS root install

I’m trying to upgrade to the Sept release on my Pi2’s but having an issue when it gets to the mediacenter-addon-osmc. Once it starts untarring, it locks up and eventually drops off the network. I’ve tried via the addon as well as from the command line with the same results. No log files of use here, but there are the following processes running when it locks:

dpkg-deb --fsys-tarfile /var/cache/apt/archives/mediacenter-addon-osmc_3.0.494_all.deb
apt-get -o APT::Status-Fd=4 -o APT::Keep-Fds::=5 -o APT::Keep-Fds::=6 -f -y dist-upgrade
/usr/bin/dpkg --force-confdef --force-confold --status-fd 33 --unpack --auto-deconfigure /var/cache/apt/a

(sorry about that last one, top cut off the full command)

Looks like UDP root was the problem, I switched my mount options in cmdline.txt to use tcp and it’s working now on both systems.