Frames dropping every 4s. when BM HDMI to SDI is used.

Hi,

Im having an issue I can't get over. Maybe someone had the same problem.

I'm using macPro2019. One output it the GUI, second is 4k 50hz to RGBlink processor, third 1920x1080p 50hz goes to BM HDMI to SDI converter and next to optic fibre converter.

In this setup FPS drops from 50 to 48 every around 4 seconds. It seems that whole system drops in that moment as even the cursor stops while being moved over the desktop.

Unpluging the BM device resolves the issue. Using ImagePro 2 causes the same problem.

Activity monitor doesn't show any peaks or drops in system performance.

Any Idea any one?

Thanks

Mariusz