ON the registrar 16 channels after a while arbitrarily writes to non-administrative users that the log / pass is incorrect?

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DS-7616NI-K2 NVR model is created by the user (upper lower case is used, the length is just over 7 characters), when adding it to the ivms4200 program, it shows that everything is fine, but after a while (maybe in a day, after a couple of hours), it writes that the login / the password is incorrect
The password also uses upper and lower case and special characters (such as %$*);