The most common reason for Dell Printer Offline problems is a breakdown in communication between the computer, wireless router, and printer via the WIFI connection. This causes a change in the IP address.
The following three factors could also be the root of this problem. One is the wireless adapter being turned off by the computer to save energy. A firewall or antivirus programme may also be to blame for the communication problem. Instead, the printer settings lack network information, or the IP address is incorrect.