Hmm, I don't have this problem, but I have another one, also related to v2rayng. When I minimize Brave Browser to listen to YouTube in the background, after exactly 12 minutes the connection to any proxy drops and the video pauses. Then I have to restart the proxy, and then the problem goes away. After that, the connection is stable and I can listen to the rest of the video. And this happens every time, exactly 12 minutes later—it sounds crazy, but it's true.
No luck with replicating the same results. You might want to try out NewPipe on Android if you want to listen to YouTube videos in background. However sometimes YouTube does not like the fact that you are connected to VPN/Proxies and might block access.