Here’s a strange one! I have a pair of Sonos Play 3 speakers linked to an Alexa-controlled Amazon Dot. The system has worked perfectly for 2 years. This week I upgraded my Amazon Music account to HD. Since then the system will play any music I choose but when I ask for any Beatles music I get silence. I have tested the Dot by isolating it and it will play Beatles just fine but as soon as I link it back to the Sonos speakers I get silence and Alexa says ‘Sorry there is a problem.’ I have contacted Amazon Customer Services and after re-setting and re-starting the Dot they can find nothing wrong with it. Any ideas? Thank you.