Intermittent login trouble

[Brown, Matthew]

I have a stable Samba install that is very happily plugging along.  However,
from time to time it will lock a user or a set of users out for no reason I
can find.  For example, UserA cannot log into Machine1, but UserB and UserC
can.  And on other occasions it will be similar except that UserA can log
into Machine1 but not Machine2, while UserB can log into Machine2 but not
Machine1.

I am running 2.0.7 as a PDC authenticating only win95 and win98 users.

brgrds,

-Matthew Brown