32 channels ip cameras are not getting displayed in screen

[integrityinfo]

Hi, i have a 32 channel nvr, and i am using 5 nos of 10/100 POE switch with Gigaport. I am not getting all channel displayed.

When i restart the NVR the 31 cameras video will get displayed, but after some time only 24 will remain.
What is the issue could any one help. I am using Hikvision.

 

[TonyR]

Exact model of NVR?
Exact model(s) of the cameras?

I ask because it is possibly a total bandwidth issue with the NVR.....

 

[integrityinfo]

Exact model of NVR?
Exact model(s) of the cameras?

I ask because it is possibly a total bandwidth issue with the NVR.....

NVR is Hikvision- DS-7632NI-K2,
IP Camera = Hikvision -
Dome - DS-2CD1023G0E-I
Bullet - DS-2CD1323G0E-1
POE Switches - Hikvision - DS-3E0310P-E/M - 5 nos

Thanks for the reply