Dahua 4216-8P Issue With Display Picture Black In Multi-Screen Mode.

I have temporary setup where i have 16 cams (dahua hdbw2320) connected to dahua nvr4216-8p.I am awaiting a larger nvr.The issue is that when you switch from single screen mode to multi eg 16 screen there is long delay before all cams appear on screen approx 30 sec sometimes.Its random but leans to a couple of cams that lag behind.I tried setting them to 1080 mode helped a little.I have used these units before with no issues.

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