If it is playing music with no problems that is odd. I’d try turning the light back on and then off again as a start. Second try would be to hook a temporary Ethernet to the blinking speaker and power-cycle it to see if the LED behaves.
From the FAQ:
Flashing white
The Sonos product is booting up after being plugged into power. The status light will also flash white while it’s waiting to connect to the network.
https://support.sonos.com/en-us/article/sonos-led-lights
Thanks so much for the help. As I noted, the speaker works fine. And thanks for the link explaining all of various light codes.
But there’s got to be an easier solution to a blinking light problem. My Ethernet cable is located in my rack under a cabinet along with all of my Sonos equipment.
The other option is to submit a diagnostic and call Sonos to have them look at it, we users can’t see the internal data.