Mac Mail

Hello Bill of SA,

If this is happening with email in the Mail app, the issue may be caused by software that loads when your Mac turns on. To try to resolve the issue, boot your Mac into safe mode and see if the same behavior shows up there: Start up your Mac in safe mode - Apple Support

Thanks.

Bill of SA,

Next, you'll want to see if it also happens in a test user. Being able to see if the issue occurs in another user account will help to identify if it is something that is affecting your entire system or just one particular user account. To do this, you'll want to set up a test user account, and then try to replicate the issue in that account.

1. Choose Apple menu > System Preferences, then click Users & Groups.

2. Click the lock icon, then enter an administrator name and password.

3. Click the add button (+) below the list of users.

4. Complete the fields shown for a Standard or Administrator account, then click Create Account (or OK).

5. Go back up to the Apple menu in the upper left of the computer and select "Log Out". At the login screen, choose the "Test User" just made.

6. Once inside the Test Account, try to replicate the issue to determine if it just occurs in one account or on the whole computer.

Thank you.