So @YouTube hasn't been working on my phone for 2 days and it's been whatever, ya know? I watched it on the computer, no big deal. But I just went to check to try the app again and now it's just disappeared from my phone?? Like what?
That's odd. Are you using an Android or iOS? If you're using an Android, uninstall the app updates > restart the device > update the app. Also, if you're using an iOS, uninstall the app > restart the device > reinstall the app. Let us know if this makes a difference.