A breakdown in communication between the PC, wireless router, and printer via the WIFI connection is the most frequent cause of Dell-Printer-Offline issues. The IP address changes as a result of this. This issue may have one or more of the following three causes. One is the computer turning off the wireless adapter to conserve energy. Alternatively, a firewall or antivirus program is to blame for the communication issue. Instead, the IP address is wrong, or network information is missing from the printer settings.