I faced the same problem with my M31S.Most of the time this happens if the phone is in areas where there is lot of moisture or if you are taking the phone to shower :)Actually if the screen has gone unresponsive, switch off the handset by pressing th...

I faced the same problem with my M31S. Actually if the screen has gone unresponsive, switch off the handset by pressing the power button. If you are able to connect an OTG connector to connect a mouse that would be the best. After you power off the p...