I doubt it was cyber, but it's too early to tell.
When I was doing Incident Response stuff and we trained with the Corps of Engineers, their training was how to go manual in the event of a cyber attack and control everything.
Let's assume that there is a lot of computer stuff in there. I don't know much about boats, but I can see a wiley attacker doing something to affect the ballast, kinda like what happened to the Golden Ray shipwreck down in Georgia(
https://en.wikipedia.org/wiki/MV_Golden_Ray ). That could make it slew wildly and erratically from how the pilot was expecting. But direct control over the rudder and engines? I'd have to assume there are backup ways to run manually in case the computers go down mid voyage.
So, I'm with
@1075tech on this. If you watch any of those "Seconds from Disaster," or "Mayday," videos on youtube, you'll see a bunch of on their own harmless errors come together to make something terrible. Tired crew, new crew, untrained crew, bad maintenance, broken part, strong wind, power outage, etc, probably a host of factors creating a storm. Much more likely, imo.