MacBook Pro M5 Experiencing Critical Issues After macOS Golden Gate 27.0.1 Update: Sudden Shutdown, Speaker Distortion, and System Freezes

Confirm that you have sufficient free space on your internal storage. The absolute minimum is ~30-40 GB free space, and as a rule of thumb you should aim to have 15-20% of your total internal storage as free space. You can check the amount of free space you have on your Mac in a variety of ways:

• Select your internal drive then click File menu > Get Info, check Available space
• Go to System Settings > General > Storage, check the graphical display at the top of the settings pane
• In Disk Utility (in Applications > Utilities), by selecting the main container disk below the drive itself (you may need to select View menu > Show all devices to see it)
• In the System Report – hold the Option key and click the Apple menu > System Information (the top menu item), look for the name of your internal drive (Macintosh HD, unless you have renamed it as I did)

Note that on versions of macOS prior to Golden Gate, the ‘available’ space reported with the first two methods above was greater than the ‘free’ space reported by the second two methods. Apple corrected that confusion with Golden Gate, and as shown in the above screenshot, the available/free space is consistent across the different methods. For more details, see this User Tip.

Some steps to take to safely free up space:

Free up storage space on Mac - Apple Support

Optimize storage space on your Mac - Apple Support

How to free up ‘System Data’ and other st… - Apple Community

See if the problem is present when you boot in safe mode. That process performs some system cleanup and clears caches, and also disables 3rd party extensions that may cause problems.

Start up your Mac in safe mode - Apple Support

If that does not correct the issue, test in a new user account. A newly-created user account will have all settings at default, and if the issue does not occur in that new account then it provides guidance on what may need to be changed to correct the issue.

Add a user or group on Mac - Apple Support

Once the testing is complete, the new account can easily be deleted.

Delete a user or group on Mac – Apple Support

Those steps will help to isolate the problem.

It might help to download and run EtreCheck, written by a long-time forum member. The free version is fine. Post the full report using the Additional Text button. No personal information is revealed. 

If you have 3rd party ‘protection’ software installed, that may be the problem. That includes:

• Cleaners (software claiming to automatically free up space)
• Optimizers (software claiming to make your Mac run faster)
• Antivirus software
• VPN software (unless provided by a school/employer to enable access to internal resources from a remote location)

Such 3rd party system ‘helpers’, ‘cleaners’ and ‘protectors’ do more harm than good. In fact, such products are completely unnecessary for macOS and the only ‘good’ (if you want to call it that) they do is to put money in the developers’ pockets. Cleaners and protectors cause compatibility issues, often after macOS updates. Commercial VPNs claim to hide your browsing activity from websites, and while that may be true those VPN providers just sell your browsing data to others. For the user, all of these types of software offer only harm…and if that is limited to harm to your bank account, then count yourself lucky. If you have installed such software, follow the developer’s instructions to completely uninstall it (note that some developers fail to provide instructions and their software installs can be pervasive, meaning the only way to truly remove it is to erase your Mac, reinstall macOS then restore your user files from a backup).

There are around 3-4 million Mac notebook computers with an M5-series processor in use, a reasonable fraction of which are now on 27.0.1 because automatic updates are on by default. If this was a pervasive issue, tech reporting would have surfaced it. Absent that, it is very likely an issue with your Mac, either due to software as discussed above, or to a hardware issue. For the latter, you can run Apple Diagnostics, visit a Genius Bar or contact Apple Support.

Use Apple Diagnostics to test your Mac - Apple Support

Genius Bar Reservation and Apple Support Options - Apple

Official Apple Support

Thanks for the detailed suggestions. Here's an update after testing:

1. Storage: about 188 GB free out of 494 GB, so free space isn't the issue.

2. EtreCheck: report attached. Performance is rated "Excellent", CPU was ~95% idle, and nothing in it points to an audio problem.

3. Apple Diagnostics: the Automatic Microphone Test failed with "The microphone didn't detect any tones from the left speaker." I ran it in a quiet room. The headphone codec, headphone jack and microphone tests all passed.

The left speaker still crackles and sounds muffled, and the left side of the MacBook gets unusually hot even when the system is mostly idle. The SSD log also shows 10 unsafe shutdowns, consistent with the sudden shutdown I described earlier.

Since Apple Diagnostics runs independently of macOS and specifically flagged the left speaker, this looks like a hardware fault rather than a software or update issue.

I'll post an update once it's been checked. Thanks again for the help.

[Edited by Moderator]