Cameras Have Strange Noise On Them That Appears And Disappers

Noise

Here are 2 comparison shots of when the noise is there and when it goes away. It cycles through this in around 30 seconds (gradually appearing more and more). Cameras are Hikvision 3MP IR domes. The network they are on isn't the best (20 Mbps down, 4.5 Mbps up). Any ideas?

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