XP Home - Maximum number of connections

We have 5 workstations all using windows xp home. I am trying to access a
mapped drive on one of the machines but get the message "An error occurred
while reconnecting to T. Microsoft Windows Network: No more connections can
be made to this remote computer at this time becasue there are already as
many connections as the computer can accept. This connection has not been
restored. The other 3 machines connect fine. The only way to get mapped
back to this drive is to reboot that machine. Why is it not releaseing the
connection?