Macbook password stopped working mysteriously

  korewa 11:08 30 Jul 2018
Locked

A few days ago my login password mysteriously stopped working after trying to log back into my Macbook after the computer was put to sleep, yet when I force the machine to restart the password does work...if I try to change the password in Preferences it does not recognize the 'old' password, even though I just logged in using it...how do change my password?

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