Blue/Yellow banding on HDO display

I have a kind of minor issue with my Fat shark HDO (FSV1122) goggle display. Basically there is a blue/yellow banding horizontally across the display. It’s not serious enough to affect flying, but I was wondering if it was related to some setting I could change to fix it.

I’ve tested the goggles with 2 different receivers and the issue is still present, also if I save the video to sdcard and view the resulting file, the banding is gone. So by elimination it’s something specific to the HDO display.

As the issue is only on the screen, I took a couple of shots with my phone camera which show the banding:

Any ideas on how to fix this?