Problem changing slug my-account to mi-cuenta

When I change the slug on the page of my account, the one that comes by default (my-account) for mi-cuenta, a loop is generated that always redirects the user to the page where the form to start is, even if they have entered username and password correct. The same happens for lost-password, if I modify this slug a loop is generated, that is, the system correctly sends the email to reset the password but when the user clicks on the link that arrives, he returns to the page where he must enter the mail, but never where to enter the new password. I repeat, it only happens if I modify the slug my-account and lost-password, if I keep them it works fine.