1, lack of memory in the Macmini will cause the Macmini8k video to get stuck, so just clear the memory.
2. If the temperature of the Macmini is too high, it will cause the Macmini8k video to get stuck. Turn off the Macmini and cool it before playing.
3. Too many MAC mini backups will cause the Macmini8k video to get stuck. Just clean up redundant backups.