Smart Videohub 20x20 sync issue with Camera feed

I am using 2 x Sony NX5 Cameras connected to the Smart Videohub 20x20.
I find that it is pot luck when I switch the camera on (set to output 1080/50) if I can get a stable picture via the Videohub. (The image will continuously blink) I can turn these cameras off 2-3 times and then it is stable. Once stable it remains stable, but if during an event a camera operator changes battery for example, the issue returns. It is not just switching the camera on and off that can fix the issue, I can remove and re-seat the SDI cable with the cameras still on a few times to get it to work. The SDI cables are fine.

I notice that when the issue occurs, the display of the videohub is slightly jerky and once that signal is pushed through to the ATEM it is causing the blinking to display on the output to the multi-view.

Any ideas or anyone else had this type of issue? Thanks

[Tony Rivera]

Are you running reference into the Videohub as well? I believe this would resolve that sync issue.

Thanks for the advice. We will try this and I will post the outcome here.