facetime bug MacBook Pro 2020

Hello maherar,

Welcome to Apple Support Communities!

If we understand your post correctly, after being on a FaceTime call for an hour the screen goes blank and the pointer turns into a beach ball. We'd like to help!

"If you need help with your connection or call quality

A slow or busy Wi-Fi network might cause issues with your FaceTime call. If you experience connection alerts or low-quality audio or video:

• Make sure that you and your recipient have a fast Wi-Fi or cellular connection. FaceTime calls over Wi-Fi require a broadband connection.
• Check for issues that might be slowing down your connection, such as someone streaming content over your network.
• If you have questions about your Internet speed, contact your Internet service provider."

For more information check out this article: If FaceTime isn't working on your Mac

Let us know if you have any questions.

Thank you for using Apple Support Communities.

Take care!