Keyboard not working

Hello, I am using iPhone SE second generation, suddenly my keyboard is getting glitch, the keys e , s , z and below that are not working. I tried updating my phone to latest software, force restart , resetting keyboard dictionary , resetting settings. But nothing worked. It is showing this issue on and off, sometimes its working perfect and at some moment it stops working. I guess it is issue with the left side of my screen touch. Its not always like this, but I am facing this issue from yesterday suddenly.

My phone has not fallen neither it has shown any other problem since now.