pixelated

Hi, I have 4 cameras set up and they have been ok so far but very recently, I am getting pixelation/corruption of some sort. The NVR system is a Dahua but rebranded as something else. Any ideas what could cause the issue as shown in the video below. FPS = 25 VBR quality = 6 Thanks!

I have 4 hikvision cameras hooked up to a xeon server running XProtect Go. When I try to view the cameras from the web client, the video is pixelated on most cameras but intermittently clears out before getting pixelated again(see attachment). I have a 50/10 cable internet connection and and...