Proxmox host reboots at the same time every week.

I have an issue with one of my Proxmox hosts, it will do a reboot at 17:14 every Sunday.
I can see --reboot-- in the logs, but I have no scheduled tasks setup for it to reboot.

I thought it could have been a hardware issue, but the seemingly weekly schedule for the reboot has totally thrown me.

Has anyone else had this issue?