I cannot make calls from Galaxy Note 20 Ultra 5G

When I touch the screen to make a phone call, it shortdown the number quickly so that I cannot push on the phone icon in order to make a call. This malfunction last for about 10 minutes or thereabouts and then it resumes normal functions again. When this happens, the camera button will not work and the videos on the phone freezes or goes into a slow motion with intermittent pause.