Common causes of Epson printer offline issues include connectivity problems, outdated printer drivers, and network configuration issues. If the printer is not properly connected to the network or the computer, it may go offline. Outdated or corrupted printer drivers can also prevent the printer from communicating with the computer. Network configuration issues, such as IP address conflicts or router settings, can disrupt communication between devices. Additionally, physical obstructions or power fluctuations may cause intermittent connectivity problems. Addressing these issues through troubleshooting steps like checking connections, updating drivers, and adjusting network settings can often resolve Epson printer offline problems.