[Koha-oz] Zebra keeps stopping?

Hi all, Hopefully a quick question: Zebra keeps on turning off at the end of each day, regardless of what the IT tech tries. We're running Koha 17.11 on a virtual Debian machine on our always-on server, and we can't find any documentation online about anyone else experiencing this issue. We've been trying to figure this out for a few weeks now, but every time the IT tech gets Zebra running again, the next day that I'm in it's turned itself off again. There might be something really simple we're missing, so I would appreciate any advice you might have. Thanks Kind regards, Michael Barry.