Camera continuously switching between day/night modes

I bought the camera Hikvision DS-2CD2421G0-IW. I was glad that it records a great picture even in low light conditions. So I decreased sensitivity in the settings from 4 to 6, so the camera switches to the night mode in the lower light:


But now I'm having an issue - the camera during dawning and sunset continuously switches every 5 seconds...

Camera continuously switching between day/night modes