Read below for many reasons on Amazon Echo dot Offline
Reason1: Loose the power connection between power outlet to Alexa device of cable. The microphone button is On condition if not then press the microphone button is On otherwise Alexa device works as
Alexa offline condition or does not respond to the voice commands.
Reason2: If Not updated the Alexa App then
Echo dot offline issues show. Then you need to always update the Alexa device with the latest version
Reason3: Wi-Fi signal also causes for Echo device offline, if your wireless signal strength is very high-speed data range then Alexa is working fine otherwise
Alexa won't connect to Wi-Fi issues show.
Reason4: Alexa device setting is proper in Alexa App is much important such as Alexa login, wi-fi router connection detail, etc.