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I have an Ubuntu host and a Windows 10 guest in VirtualBox. I never had any trouble until a few weeks ago when it started that the VM shuts down unexpectedly. This has happened maybe 10 times in a few weeks. I've been checking Event Viewer, and I always see a log entry that The previous system shutdown at [some time] was unexpected.

I ran a Malwarebytes scan which found nothing. I ran chkdsk before booting and it found nothing. I checked the host's memory (while booted up; it is a remote machine) which found nothing. I've gotten a few Windows updates since this started. I'm not experiencing any problems with the host.

What might be causing this problem?

Update: I got another shutdown. My log has several thousand lines of:

25:38:59.216591 VMMDev: vmmDevHeartbeatFlatlinedTimer: Guest seems to be unresponsive. Last heartbeat received 4 seconds ago
25:38:59.274772 VMMDev: GuestHeartBeat: Guest is alive (gone 4 058 509 144 ns)

I don't know why I didn't see that in the logs before.

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  • If you have a VirtualBox VM that ceases to function, then VirtualBox should generate a log, with information with regards to what actually happen. The logs within the VM are not helpful, as they only contain, the events within the VM and not the host.
    – Ramhound
    Commented May 6, 2020 at 17:54
  • Oh, sorry, I failed to mention that I have looked through the logs in ~/VirtualBox VMs/Windows/Logs and haven't found anything relevant. At the moment, the logs have a bunch of startups and shutdowns that I think are intentional. I'll check again when I get another unexpected shutdown.
    – aswine
    Commented May 6, 2020 at 18:17

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