> So, my question is threefold, I guess: has anyone encountered this 
> problem? can anyone explain why this is happening, in technical terms? 
> is there anything I can do to help it?
Yup, I had this problem.  I solved it by using Hideaki Goto's Heartbeat
(keepalive) patch for openssh clients.  See the following page:
http://www.sc.isc.tohoku.ac.jp/~hgot/sources/openssh-watchdog.html

    -Mike Arrison

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