Thank you for your support of Xiaomi. On the Xiaomi 15T Pro, the YouTube App sometimes freezes when reopening after running in the background. This happens due to an Application Not Responding (ANR) issue in the App itself, and has already been reported to Google for resolution.
To ensure an optimal experience, please refer to the following information:
Press and hold the [YouTube] App icon on the Home screen >> [App info] >> [Clear data] >> reopen the [YouTube] App.
Update the App to the latest version in the Play Store after Google releases a fix.
These steps help ensure that the App can restart properly and continue to provide a stable playback experience while awaiting the official resolution from Google.