Never had such an experience.
When you plug it back in, you could try to submit a system diagnostic within 10 minutes, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here, they get sensitive about GDPR. It’s possible that why that ‘chime’ went off would still be in the ‘buffer’ maintained by Sonos. Of course, it might be the ‘chime’ was generated by the TV, and not the Sonos, and the Sonos was just playing what it was handed through the connection to the TV.
There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.
When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.