Alexa Yellow Ring flashing means some notification are incoming on the inbox. 

Reasons for the Yellow Ring is 

Ignore the message/notification

Internet Connectivity Problem

Alexa App Setting Problem

Wi-Fi network connectivity Problem

How to Turn Off the Alexa Yellow Ring

Resolve the Internet connectivity Problem

Solved the Alexa App Setting Problem

Solve the Wi-Fi network connectivity Problem

Contact with Alexa Echo Setup Expert team

If your Alexa Yellow ring problem is not solved then You need to contact the Echo Help expert today. Call us: +1-817-464-8883