If your touchscreen isn't responsive or not working how you would expect, try restarting your PC. If you're still having problems, check for updates: Select Start, then select Settings. In Settings, select Update & security, then Windows Update, and then select the Check for updates button.
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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 phone, just take a hair dryer and heat blow dry the handset for around 30 seconds on both sides, repeat the process 2-4 times. then leave the phone for 5 minutes and start the handset. The screen should be working.
