On monitor, if you find image keeps changing from one camera to another one, please stop it refering to method below.
Go to Main Menu---System--Tour and disable tour function.
Go to Main Menu---Alarm---Motion Detect and make sure no number on tour is lit up
Go to Main Menu---Alarm---Video Blind and make sure no number on tour is lit up
Go to Main Menu---Alarm---Video Loss and make sure no number on tour is lit up