Assuming you have a good connection and the application is working correctly, you may still face problems. It's a good idea to try streaming on another device. For example, if it works fine on an Xbox but not on your PC, there's a device-specific problem. But, if all of your devices are buffering Disney+, it may be an issue with the streaming service. To be sure it isn't an issue on Disney's end, check the DownDetector website. Type in 'Disney Plus' and click enter. Review for any reported outages. You can also read through other users' complaints. Assuming there updated reports of issues, you'll need to wait it out, unfortunately. The developers behind Disney+ are likely aware of the issue and working to fix it.