I am having the same issues you described… last night I had 1147 related errors.
I first noticed this trouble in March 2022, On a daily basis I have been searching for someone that knows how to fix this problem. Can you help me? It looks like you did not get a response either. Can you tell me how you resolved. I have tried everything including a new install.
2022-03-13 12:46:25 WARNING (MainThread) [alexapy.alexalogin] No access token found; falling back to credential login instead of oauth.
2022-03-13 12:46:26 WARNING (MainThread) [alexapy.alexawebsocket] mac_dms not detected; websocket likely won't connect
2022-04-27 10:18:38 ERROR (MainThread) [homeassistant.components.alexa.state_report] Error when sending ChangeReport for binary_sensor.kasa_smart_plug_150 to Alexa: INVALID_ACCESS_TOKEN_EXCEPTION: Access token is not valid.
2022-04-27 10:53:33 WARNING (MainThread) [homeassistant.components.http.ban] Login attempt or request with invalid authentication from ec2-18-210-7-77.compute-1.amazonaws.com (18.210.7.77). (python-urllib3/1.26.6)
I have thousand plus more examples… Same thing . Any ideas?