I've started seeing this in my logs every 1/2 hour for one of my Echo devices.
getPlaybackState | 400 Error | Msg: status code: 400, reason phrase: Bad Request
It's a Gen4 Echo Dot without clock. I have various lines commented in the app and device code per the posts below, but I am still seeing the error. Not sure when this started again at this point.
Anyone else seeing this error again? Anyone have a current fix?