ISTR that I've read about some bugs with packet traversal through VM NAT
setups.
It was something about the RST packet triggering NAT destruction but not
being relayed further all the time (some race condition?!), that sounds
as if it fit the bill here.
https://forums.virtualbox.org/viewtopic.php?f=1&t=20579 comes close but
is a bit old...
You could try to use the TCP keepalive settings in SSH, and/or to reduce
the MTU size (as mentioned in another mail here already).
Else a few more setup details might help...
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