I have a G4 with dual 1 gig processors that has started to intermittently stops communicating with the network. I am able to see the entire network immediately after it happens and I can reconnect without any trouble. This may happen once a day or once a week. I have re-install the system on a reformatted hard drive, then upgraded to 10.3.9. It has happened with OS X Server 10.2, OS X 10.2, and OS X 10.3.9 I have changed out the hard drive. I connected to a different network and tried different hubs and wires. I have not tried a different network card (I am using the built-in network). Unfortunately this unit is a server so this type of problem is unacceptable, no matter how rarely it happens. Any ideas?