As added info, I installed 5.1.6 form tetsing on some of the affected machines, and the problem is indeed gone, local filesystems don't randomly get unmounted on autofs restarts or expires.
Thanks! -- The choice of a Deliantra, the free code+content MORPG -----==- _GNU_ http://www.deliantra.net ----==-- _ generation ---==---(_)__ __ ____ __ Marc Lehmann --==---/ / _ \/ // /\ \/ / schm...@schmorp.de -=====/_/_//_/\_,_/ /_/\_\