As Google pushes newer Android versions, devices running Android 5.1.1 (API 22) have been left behind. The official YouTube app now requires Android 8.0+ for the latest builds.
Go to Settings > Apps and disable heavy, background-running apps that you do not use (such as Google+, older carrier bloatware, or legacy syncing apps). This frees up vital RAM for your video playback software. Summary of Options for YouTube on Android 5.1.1 Performance Difficulty Non-Functional None (Broken) High (Requires root/hacks) NewPipe Legacy Background play, No ads, Downloads Low (Simple APK install) Lightweight Browser Full account sync, Playlists Very Low (No install needed) Youtube For Android 5.1.1
