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High pitch sounds still lingers for a good ten minutes even after the unit is no longer playing. This unit is a few years old. The Play 1s do not emit this noise.
Sounds unusual, to be sure. I'd be tempted to submit a system diagnostic within 10 minutes of replicating this issue, and either post the number here, or contact Sonos to discuss it. There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.
Hello there, buddman442. Thanks for the post and welcome to the Community. If the Play:5 is making a high pitched sound regardless if the content is playing or not, I would recommend trying a different outlet for the Play:5. This will check to see if the Play:5 is having a problem with the power source.



Additionally, feel free to submit a diagnostic report as Bruce said above. be sure to reply with the confirmation number and we can take a look to see if any power faults come up.



If the issues persist after changing the outlet, give our support technicians a call. They are able to finalize any other troubleshooting and replace the unit if needed.