Some owners of the 16-inch MacBook Pro have reported that their machine restarts when it is in standby, even when it is idle and plugged in. A priori, the problem appeared after the update of macOS 10.15.4. If you too have experienced the same annoyance, there is a solution while waiting for a new patch from Apple. Indeed, the firm has already published a corrective version of this version, but visibly not correcting all the problems.

PowerNap is guilty!

If the overall problem concerns unexpected reboots, two use cases are possible. We speak of putting the computer to sleep and opening it after a vigil. In all cases, sleep is the common denominator.

It can be read on Apple’s forums, shortly after the update was released by Apple, many owners of the latest 16-inch MacBook Pro complained of a strange bug. There is even one person who tried to reset the SMC, NVRAM, and others, but without success.

Finally, the answer is to be found in the management of the energy saver and the PowerNap function introduced in OS X Mountain Lion in 2012. It is a practical feature that allows your Mac in standby to wake up promptly for do things like manage Time Machine backups and receive emails.

But apparently PowerNap has been failing since the last update. So, just deactivate it by going to:

  • System Preferences
  • Energy Saver
  • Uncheck PowerNap

We will therefore wait for an update of macOS 10.15.5 to reactivate PowerNap which keeps your computer up to date without turning everything on.


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