What you describe in relation to the volume-level constantly lowering, sounds very much to me like voice assistant ‘audio ducking’. If that is the case and you don’t want that across certain Sonos devices, you will likely be able to address that in the voice assistant App. In the case of Amazon Alexa you would go to the Amazon Alexa App and simply remove the speakers from the controlling group/device that is responding to the Alexa wake word. Deleting the group itself (if not required) is perhaps an easy/quick solution in some cases.
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What you describe in relation to the volume-level constantly lowering, sounds very much to me like voice assistant ‘audio ducking’. If that is the case and you don’t want that across certain Sonos devices, you will likely be able to address that in the voice assistant App. In the case of Amazon Alexa you would go to the Amazon Alexa App and simply remove the speakers from the controlling group/device that is responding to the Alexa wake word. Deleting the group itself (if not required) is perhaps an easy/quick solution in some cases.
The likely ‘separate’ issue about the connection to Spotify being lost, is perhaps down to network interference - you may find these two links helpful and hopefully a beginning to help resolve that matter: