Marshmallow - phone off when not in foreground

Hi
I have had a Marshmallow 6.0 phone for a while, but I do not know for sure if the problem has been there from the beginning - and if not, when it appeared.

In brief, when I make a phone call, whichever action that puts the phone off the foreground, like hitting home button, or even trying to add a contact, interrupts the phone call instantly.

Is there a way to tackle the problem other than reset the system? Thanks
Tom

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