I indeed had a virus like that in the '90s. I had an Amiga 1200 that booted itself randomly and at the time I couldn't find a virus checker that recognized the virus. I had no choice but to erase all infected disks (a lot!). But I suppose these days virus checkers probably can find that s.o.b of a virus more easily. Good luck! :pint:
Edit: Yes, the random crashing went away with the formatting and everything was back to normal once again.