Netflix crashing ATV 4K?

My ATV 4K seems to crash regularly. I'm watching something and suddenly my TV says no HDMI input. Wait 90 seconds and the ATV home screen pops up. It seems to do it most often when using Netflix, but it's also done it at other times. The ATV is on a wired connect, so there are no wifi issues, and my house has a 150Mb internet feed so I don't think it's networking.

I think the Netflix app is crashing the ATV.

Anyone else seen this or having this problem?