Something trying to open Safari during sleep

Hey davidfromcarlton,

We recommend booting into safe mode to determine if the issue is related to software that loads when the Mac boots up. If the issue doesn't happen in safe mode, then the issue appears to be related to app/software that starts when the Mac starts.

For information on booting into safe mode, click here: Start up your Mac in safe mode. After testing in safe mode, restart normally to see if issue is resolved.

If still not working in normal mode, you'd want to isolate the app/software that's causing the issue. To isolate, follow the steps below or in this article: Remove login items to resolve startup problems on your Mac.

1. On your Mac, choose Apple menu  > System Settings, click General  in the sidebar, then click Login Items on the right. (You may need to scroll down.)

2. Make a list of the login items in the Open at Login list—you’ll need to remember them later.

3. Select all of the login items, then click the Remove button .

4. Choose Apple menu  > Restart.

5. If this solves the problem, open Login Items settings again, add the login items one at a time, and restart your Mac after adding each one.

When the problem occurs again, follow the steps above to remove only the last login item you added.

Hope this helps. Take cafe.

Hi davidfromcarlton,

Welcome to Apple Support Communities. We recommend to use Activity Monitor on your Mac and see which application or process is not responding. This may help determine the application that's causing this error message. Here's how:

"Quit an app or process in Activity Monitor on Mac

You can use Activity Monitor to quit a process, even if it’s in a loop or not responding. You can also send a signal to a process to terminate it. If you attempt to quit a process you don’t own, you may be required to authenticate as an administrator.

1. In the Activity Monitor app  on your Mac, under the Process Name list, select the app or process you want to quit. An unresponsive process is marked with (Not Responding).

Note: The Process Name list is not available in the Cache tab listings. 

2. Click the Stop button  in the upper-left corner of the Activity Monitor window (or use the Touch Bar).

3. Choose one of the following options:

• Quit: This is the same as choosing File > Quit within an app. The process quits when it’s safe to do so. If quitting the process could cause data loss or interfere with another app, the process doesn’t quit. 

• Force Quit: The process quits immediately. If the process has files open, you may lose data. If the process is used by other apps or processes, those apps or processes could experience problems.

To see if a process is used by another process, choose View > All Processes, Hierarchically."

Following these steps may help and is outlined in this helpful article: Quit an app or process in Activity Monitor on Mac - Apple Support

Kind regards.