[Samba] messages.tdb growing large

[Joe]

Running Samba 3.5.8 on Ubuntu server 11.04 32 bit.
Server is HP DL-385 8 core - 16GB 1TB raid 1.
My messages.tdb file is 664223744 bytes and we are
having strange problems with printers.  My print queues
will die and nothing prints.  One way to fix it is to
comment out the printer from printcap, save it printcap,
then reverse the process.  This fixes the printer but the
same problem occurs several days later.  Also the number
of documents listed in the windows "printer and faxes"
screen shows some huge numbers that never go away even
though there are no docs in the queue.  Any ideas on
what is going on and how to fix it?