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I am sorry to hear that you are having this issue. Follow these steps please.
Shut down the Mac.
Then Follow these steps to start up into safe mode.Hold down the power button for ten seconds. Then, press the power button again to restart your Mac.
After the Apple logo appears, it might take longer than usual to reach the login screen or your desktop. This is because your Mac performs a directory check of your startup disk as part of safe mode.
To leave safe mode, restart your computer without pressing any keys during startup.