Due to the hardware bug where the network loses connection on the PI Zero it is necessary to either restart the network or the Pi.
I thought I had done this by logging in as root, running crontab -e and then adding a script to reboot the Pi. However I noticed it wasn't working.
In the end I found out it was reporting "Command not found" on shutdown.
Crontab clears out the $PATH variable when running.
The solution was to command an explicit shutdown:
/sbin/shutdown -r
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