Question Galaxy A20s top of the screen unresponsive when lying on a flat surface

[Nobody-76]

hello
I recently bought the Galaxy A21s and I noticed that when it's lying on a flat area the top of the screen doesn't work I can swipe and unluck my phone but I can't swipe down the notification bar unless I pick up my phone and also the touch sensitivity gets low when holding in a specific way especially in landscape mode.
I was just wondering if all the A21s share this problem or the problem is from my phone only ? also cuz it's new they didn't have a protector or a cover and they used A71 protector I wonder if that's the problem?

 

[KPNQUET]

For me atleast it was the screen protector

 

[iodro]

Go to Settings>Display>touch sensitivity. The screen protector may also be causing issues.