Hi, I think you are having issues with casting your phone while watching Youtube content. Please head to settings in Youtube app and select 'Watch in TV' option. Configure your TV in that app and you will be able to easily cast your Youtube content on your smart tv.
Hi, download an app called Galaxy Button Lights 2 (available for free on PlayStore). You would get complete control over the touch light of navigation keys. You can reduce the intervals or even completely disable the lights.
Hi Jason, I read your problem just now and hope it has been resolved till now. But if its still there, then try pressing power button for a couple of seconds until it vibrates & reboots. This would resolve the issue.