iPhone Keyboard stops working, touch screen stops responding intermittently

Harrowing experience.

1) key board back space key does not work and stops responding intermittently

2) occasionally the screen misbehaves, while you are in an app or on the home screen, a touch on the screen makes the response frozen

3) while functioning, suddenly you see a timer on the screen and the phone goes back to screen lock mode

Is it because of the once again, buggy IOS or hardware fault ? Apple pls don’t fool your long time customers, the day is not far when we will move to alternate options !