The blinking green light on an Xfinity router typically means that the modem or router is trying to establish or stabilize its internet connection but is struggling to do so. It indicates that the connection is unstable or not fully established yet—unlike a solid green light that means the connection is stable and functioning normally. Common causes for the blinking green light include:

• Loose, damaged, or poor-quality cables or connections
• Overloaded network with too many connected devices
• Overheating of the modem/router
• Network outages or server maintenance by Xfinity
• Firmware issues or outdated software
• Hardware problems such as damaged antennas or internal components

Recommended troubleshooting steps are:

• Check all cables and connections for tightness and damage
• Power cycle the modem/router by unplugging it for at least one minute, then plugging it back in
• Verify if there is a service outage in your area via Xfinity's outage information
• Disconnect some devices to reduce load on the router
• Ensure proper ventilation to prevent overheating
• Update the modem/router firmware if applicable
• Contact Xfinity customer support if the issue persists, as it may be a hardware failure or require a service check

In summary, the blinking green light is a sign that the modem/router is struggling to connect or maintain a stable internet link, and physical checks, power cycling, and verifying service status are the first steps to resolving it.