Ultimaker Original+ Crashes/Reboots soon after start print. Help?

[munnimun 0]

A little while back I tried to print something, and the printer wouldn't print past the halfway point. Now I've gone in today and tried to just print out a simple cube, and again it wouldn't print for very long, however, it seems be print for a much shorter time now before it stopped - about two layers into a simple cube.

 

Now these times I wasn't really paying attention, figured this last time I'd stay with it and see what would happen. So it happened, it stopped at the second layer, and it seems like the whole machine just crashes and reboots - the screen gets all diagonal stripey and then it shuts down and restarts.Here's the video showcasing the issue:

 

 

Does anyone know what causes this specifically? I haven't fiddled around with anything software-related, let alone hardware (this machine was set up for me a couple years ago, I haven't used it very many times). I've tried googling to find a solution or what is causing this, but it's leading me absolutely nowhere. (just to this forum but regarding completely different printers/issues)

 

Firmware was last updated March 2018 - it had been printing fine before this.