Every video, I get errors in the UI. I once powered through, it seems eventually the video does play normally. Perhaps that is because of blocked ads(by newpipe then - I have no other restrictions on mobile)
Keep NewPipe updated. You must install every update as soon as it tells you one is available. I've not got any error for a while.
Also, add the NewPipe repository [1]. The versions in the main F-Droid repository are often out of date.