We have recently added a new Powerbook running OS 10.3 to our small network - four other machines and a printer. The machines are linked via a ethernet hub. One iMac running OS 9.2, will not stay connected to the Powerbook. - Two other iMacs running the same OS will!? The network failures seem quite random. Sometime the iMac and Powerbook will stay connected for a couple of hours, other times only a few minutes!