Most of Alexa users has faced issue when they seen the Red ring light on Alexa Echo Dot.
The Alexa Echo Red Ring light issue has shown due to low Wi-Fi connection or lost wi-fi connection, or your device's microphone has been disabled can't listen your voice commands. Follow the steps to fix the Alexa Echo Red Ring issue. Also you can contact Alexa Helpline support through Free Live Chat or +1-872-888-1589