I suggest that you first remove the system software and restart, restore and restore it to see if there is still this phenomenon.If you still have to go to the maintenance point, check whether it is a hardware problem.If such problems occur occasionally, you can refer to the following methods: 1. Double clear data can solve such problems; 2. Restoring exit settings can solve these problems; 3. Brushing the machine should completely solve the problem; 4. If the above methods are invalid, you can send them for repair.