Sudden "end call" during a call

It regularly happens so that during an answered phone call,
there is a sudden beep (short slighly annoying signal) and
call ends right afterwards.
If this is due to screen sensitivity -  is there a possibility to change
the screen sensitivity settings or change the way how the "end call"
button work (not by simply pressing, but, say, by some sliding gesture) 
p.s. just swapped from iOS to android 

Hi ruslanskalvans,
Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
When you are on a call, does the screen stay on the whole time? 
As Uliwooly stated it could be the proximity sensor, you may want to try a diagnostics test.
Menu > Settings > About phone > Diagnostics > Proximity sensor.
Let us know.
 - Official Sony Xperia Support Staff
If you're new to our forums make sure that you have read our Discussion guidelines.
If you want to get in touch with the local support team for your country please visit our contact page.

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