Iphone X: different screen bug as everybody + improvemen suggestion

Hello,

I am writing for reporting two things related to my Iphone X.

First, I also have troubles with touch screen not responding. But it seems to be a different one from what most ao the users are having. I can always answer to the phone calls, but SOMETIMES (let's say 10 times in a month) my screen stop responding when I START a call. The call is not stopping, so people can answer to it and I can talk to them, but for instance I cannot turn on the loudspeaker or close the call.

Second: During a phone call a simple touch on the screen is activating a command. From the very first iphone, it was possible to LOCK the screen while we were calling someone. And if I lock the screen while I have the phone call, it means that I dont want the screen to be unlocked.

It happened dozens of time that I was accidentaly closing a call by slightly touching the screen that was supposed to be locked.
That's a non-sense feature since when everybody is calling with earphone or loudspeakers, is also often having the phone in his hands. Please in the next update, if I lock the screen while I call, let the screen to be locked! Then, if I really want, I will unlock with my face ID.

Thank you for your attention, I am waiting for feedbacks!