I've had this annoying bug with the Youtube app for android for a couple of months (Samsung Galaxy S5 neo).
When i click a video it runs perfectly fine for around 30 seconds but then the video freezes (the sound and video time bar continues). I tried removing all Youtube updates to see if it had something to do with a new update but no it still has the bug. It doesn't bug on every video but on most of them it does.
I am really getting annoyed so can someone please help me?