Netbios ????

I have a couple of workstations that just out of the blue the last 2-3 days,
can not connect to a couple of servers in another domain. The have always
connected before, have all the same ids/pws... Nothing has changed on
either of the workstations or the servers. They can connect if they use an
ip. If I go in to the ip properties on the workstation and change anything
then change it back and save, then they are ok till they rebook. The
servers are in the DNS
It's as if netbios of some little part just stopped working.

Anyone have any idea what's going on and how to fix it permanently???

Might have something to do with the last auto-updates.

John