Blinking orange light on Xfinity modem/router

I recently installed an Xfinity XB7 modem/router and I use the ethernet ports to connect a Lenovo 320 laptop running Windows 10. I am using a new Xfinity supplied ethernet cable and when I plug it into the main ethernet port (the one with the orange stripe) I get a blinking orange light. If I plug the cable into other ports, the light is green. Everything on my computer is running properly and the internet data transfer speeds are correct according to Xfinity's tests. Everything is working properly as far as I can tell, but the light blinks orange on the main port rather than green. Any ideas on this issue?