I watch DAZN with VPN. I used to connect my MacBook Air (Early 2020) to the TV (Samsung UN40H6350AF) with an adapter and HDMI cable. At times the video wouldn't show up but I could hear the audio from the TV. However, a quick unplug/plug back in would fix the issue.
Bought a Roku Express 4K+ mainly to AirPlay. Unfortunately, the video issue (see photo) persists and I cannot resolve it. I've tried DAZN without the VPN, I've used the HDMI cable provided with the Roku and the one I used with my adapter, and I have also updated my Mac from Big Sur to Monterrey. No luck.