Ongoing issues with Bluetooth on Intel based (2018) Mac Mini running Sonoma ...

You will need to find Ventura 13.6.4 (latest version).

1. Do as if you want to install. Then Quit before install once diwnloaded.
2. Make sure you backup all your data present on the mini. Ideally, external drive.
3. Perform clean install of Ventura.
4. Reinstall all your apps
5. Recopy all data from external drive.

I am personally avoiding Sonoma on my mini 2018 as long as i still read issues. I do have a M2 MBP as well as an intel-based MBP (2020) on Sonoma and both work fine. But, i don’t have the same needs for these MBP as i have with my mac mini 2018.

How to Reset Your Mac's Bluetooth Module to Fix Connection Issues...

https://www.macrumors.com/how-to/reset-mac-bluetooth-module/

Resetting the SMC (removable batteries)

• Shut down your MacBook and remove the battery.
• Disconnect the power adapter.
• Hold down the Power button for 10 seconds and release.
• Reconnect the battery and power adapter.
• Boot up your Mac as usual.

Resetting the SMC if iMac, Mac mini, or Mac Pro

• Shut down your Mac.
• Disconnect the power cord.
• Hold down the Power button for 5 seconds and release.
• Reconnect the power cord.
• Boot up your Mac as usual.

Hey there Wally_Wombat,

We understand that you're having issues with Bluetooth on your Mac mini. We'd be happy to provide information to help you address this.

You'll want to reach out to Apple Support for assistance with this: Apple Support

Kind regards.

2019 MacBookPro - bluetooth undiscoverable since update with Sonoma and continues with 14.1.2

Can someone explain how to downgrade back to whatever was before Sonoma?

Thanks,

MH B.

[Edited by Moderator]

Additionally...

https://www.imore.com/how-downgrade-macos