have you configured driver with static ip?
proabably the ip changed , and therefore the driver cannot connect anymore
try using static ip adres or dhcp reservations
Tried to use Phaser 8560DP and found it was disconnected from the network. Tried restarting, but it still does not show as an available printer. Suspect power was out last night. When try Network Diagnostics result is "No DNS Response (ND18). I checked and IPv4 is ON, as is DHCP/BOOTP & AUTO ID. I tried using phasersmart.com to check the printer status using the IP and it cannot connect. Would appreciate some help. Thanks.