Thank you for reaching out. Do you experience these symptoms if you test your device in safe mode? If your phone is misbehaving, it's possible that a third-party app is causing the issue. To figure out what app is acting funny, you can use the Safe Mode feature. In Safe Mode, your phone won't run any third-party apps. This allows you to easily identity and remove the app that may be causing the problem. Give this link a try: https://www.samsung.com/us/support/answer/ANS00062983/
I would also recommend force stopping and clearing the cache on your YT music app. Go to settings > apps > tap on YT music > tap on force stop > then tap on storage and tap on clear cache
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