🚀 go-pugleaf

I recently started using vm, and until yesterday, it worked fine.
Today, I started it up and in addition to the 12 messages sitting in
INBOX, it was unable to pull the 66 messages I know to exist in the
file /usr/spool/mail/jailbait
Indeed, <v>isiting this file found all the messages that were supposed
to be there.
Puzzled, I quit vm and then restarted it. This time, it managed to
pull SOME of the messages from my mailspool, bringing the message
count in INBOX to 57 instead of the expected 78.
Now, I know that the system I'm on tends to be short of disk space. Is
this behavior normal for a full disk write error or is this something
else?
I'm using...um...
--**-VM 5.31 (beta): INBOX   14 (of 57)   6:49pm  Mail   {unread}

I don't have a private .vmrc and am unsure of the contents of the
systemwide.

Thanks for any help,
JB (Rich)