Airport Extreme Issues

I have a 5 year old airport extreme base station that is working well as a wireless router. The solid green light, however, has started flashing amber. It still works the same but even after reseting with a paper clip I can't get the green light back on. Is there cause for concern? Any help would be appreciated.

Its possible the power supply could be failing but usually they last longer than 5 years or at least mine is 6 and still going.

Have a look at this article:

Wi-Fi base station: Understanding and resolving a blinking amber status light