Hi @silversmith,
Sorry to hear that you’re having issues with the volume on your Move.
The volume should stay the same until you change it again, either through Alexa or through the Sonos app. If you set the volume of the Move in the Sonos app, does it stick or does this also change again when you use Alexa?
I can’t say why the volume isn’t sticking, but I’d recommend waiting for the issue to occur again, submitting a diagnostics in the Sonos app, then contacting our support team. They have the necessary tools available to troubleshoot the issue with you and help resolve it.
I hope this helps!