4.3bsd hostname->IP address lossage?

[Mike Urban]

Twice in the last month we have experienced a situation in
which two or more Vaxen running 4.3bsd *simultaneously* lose
their ability to map host names to their IP addresses.  
Rebooting alleviates the symptom, so it is not the disappearance
of a file or anything similar.  Most peculiar is the fact that
the event appears to happen at the same time on unrelated systems running
vanilla 4.3bsd; no NFSish tricks are involved.

Has anyone experienced anything like this?  What sort of 
Remarkable Event could trigger this syndrome?  How can
it be corrected short of a reboot.

	Mike
-- 

	Mike Urban
	urban at rand.ORG