Flickering Daytime Images?

I have a problem and not much help. I have a Savvy Tech system or Dahua with 16 Channel NVR full of these cams. 8- Model Number: DH-IPC-HFW54A1EN-Z (motorize lens) 8- 4MP DH-IPC-HDW44A1EN (fixed) there is an ever so slight undulation more so on the motorized zoom cameras and not as much with fixed lens but a few have same issue. The new camera I put in as replacement worked fine with a ever so hardly noticeable scene change. It is not a flickering video problem hard to explain, WDR setting help significantly but still visible.

I am going back to do the following:

Manually set Iris get it off auto... test cameras with issues off NVR on laptop thus eliminate NVR HDMI output...What else should I try?

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