root not properly dismounted as Virtualbox guest

Running FreeBSD as Virtualbox guest. I always run poweroff as root or hit the shutdown icon on XFCE4. Most of the times, after powering on again, it reboots 2 or 3 times and displays:
Code:
WARNING: / was not properly dismounted
[...]
Starting file system checks:

5s1nUFW.png


Eventually everything works fine, but wonder what may be happening.
 
Thanks.

Here, symptoms are sporadic. I do often run the risk of multiple CPUs, and sometimes get panics with that risk. Yesterday I had a series of one panic after another, after another, after another … and so on.

Never a panic with the guest limited to a single virtual CPU.
 
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