Issues with Pixel Streaming (stuck on "WebRTC connected, waiting for video")

I’m having some issues with deploying my project using Pixel Streaming (using UE4.25 and AWS). Sometimes it works fine, other times, it gets stuck on “WebRTC connected, waiting for video”. It works again if we reset the instance on AWS. When it’s working fine, I’ve tried loading it up on multiple devices (some wifi, some 4G) and I can’t replicate the issue. Then, when I check it later, it is stuck again on “WebRTC connected, waiting for video”. On some occasions, it has been working fine on some devices/connections, but not others, at the same time. I’m struggling to understand the issue. Any advice?

I am experiencing the same issue using the Opera browser on UE 4.26, I haven’t found any solution yet.