Lower the audio quality
Some users suggest lowering the audio quality as the songs are buffering on the highest one (256kbps AAC). You can do that in the app settings and, hopefully, the issues will stop once you transfer to Normal quality. We understand that this shouldn’t be a thing, but it seems that Google still needs a lot of work to make YouTube Music a valid successor to Google Play Music. //

Disable Battery optimization
Another possible reason for YouTube Music stopping mid-playback is the aggressive system app management. Some Android skins tend to kill the apps in the background to save battery. You can avoid this by disabling Battery optimization for YouTube Music.