If it is happening to all of the computers at the same time, then you either have an issue with your network wiring/switch or a problem with the copier itself. I don't see the C460 listed on the Konica product list so you may have a model that is only sold and serviced through the dealership where you purchased it. If you can confirm that it's not a wiring issue with a new network cable and/or switch, then I would recommend calling the dealer that you bought the copier from to have them troubleshoot the machine under warranty. Even if you aren't able to confirm that the network wiring is OK, you can still probably convince the dealer to send a tech out for maintenance.