@j0j024: I'm really sorry to hear that you're experiencing this issue when using the Camera app on your Galaxy Note 20. Do you get any notifications to say that your device is heating up when you encounter the problem? If not, please try closing down any apps you're not using by tapping the Recents button in your Navigation Bar, and swiping upwards on the relevant app preview windows (or hitting 'Close all'). Now, head to Settings > Battery and device care > Optimise now, then select Memory > Clean now to reduce your background activity. Furthermore, head to Settings > Apps > Camera > Force stop > Storage > Clear cache, then restart your phone. Let me know if this helps.