Apple TV keeps cutting out running Zwift

I’ve posted about this before but changed to use my mac to run zwift. However, I’ve recently gone back to my Apple TV but when running Zwift the TV cuts out of between 1-3 seconds before showing the game again.

I’ve tried everything but cannot figure out why the picture cuts out all the time. Does anyone know what might be causing this? I have tried two different Apple TV boxes (one 4k, the other standard) and two different TVs but they both cut out all the time.

Could it be the HMRC cable, perhaps?

Try a different hdmi cable