You may also clear the app data to reset it to factory settings. You can do it by following the steps below:
1. Go to the FireStick Settings from the home screen.
2. Click Applications.
4. You must now see this list of the installed apps. Go ahead and click the streaming app with buffering issues.
5. The right portion of the window displays information about the app data and cache data. You can do either of the following:
- Clear data: Select this if you want to delete all app-related data, including the sign-in information, and want to reset the app to factory settings along with clearing the cache.
- Clear cache: This option will only clear the cache and keep the remaining data intact.