hikvision ds-7108n-sn/p

I have a HikVision DS-7108N-SN/P (8 channel with POE) NVR, Chinesse mod to English . I have 8 HikVision Cameras (1x DS-2CD2732F-IS, 2x DS-2CD2135F-IS, 3x DS-2CD2532F-IS). I did at one point get a live view with all 6 cameras attached. One of the cameras (2732) was very pixelized (Maybe less...