Your speaker is also known as the Sony SRS-XB100. It may simply have lost its Bluetooth connection to your computer. Sony provides lots of advice here:
https://helpguide.sony.net/speaker/7856/v1/en/contents/TP1000946304.html
See in particular:
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I have a Sony external speaker model YY7856E which was working well until I switched to windows 11, 365 and Edge. Now it isn't recognized - please help!
Your speaker is also known as the Sony SRS-XB100. It may simply have lost its Bluetooth connection to your computer. Sony provides lots of advice here:
https://helpguide.sony.net/speaker/7856/v1/en/contents/TP1000946304.html
See in particular:
Hi Carolyn,
Does the speaker connect via Bluetooth or 3.5mm jack?
While it is connected,
Press Windows+R keys on the keyboard, or Right-click Start on the Taskbar and choose Run.
Type mmsys.cpl
Press Enter.
Take a screenshot of the recording tab and post in the next reply.
I’m eager to hear back and work together to find a solution.
If your Sony external speaker model YY7856E is not recognized after switching to Windows 11, there are a few steps you can take to troubleshoot the issue:
services.msc in the Run dialog (Win + R), finding Windows Audio, and ensuring that it is started.If these steps do not resolve the issue, it may be necessary to contact Sony support for further assistance regarding compatibility with Windows 11.
References: