appletalk tripping intermittently

hey,

could anyone help me out here?

Running a winnt n/w with some macs.
now, the macs all operate in a zone
“allmacs”. Trouble is, some of the macs,
when i check the appletalk control panel,
have “zones undefined”, as such I can
only see about 4 systems instead of 20.

I checked my settings and everything was
configured correctly.

after a short while, when I again checked,
all became normal.

Why?

could anyone please explain what
happened?