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Random carrier loss on phone calls

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Hi @All

When I'm making a phone call all of the sudden the phone drops all connectivity.
It interrupts the call with a beeping sound and then the message "mobile network not available" pops up.
But not only is the mobile network gone, but also wifi.

After a few seconds the connection to the carrier is established again and I can repeat the phone call.
Sometimes it then works but often I get the next connection loss.

I'm facing this problem on my 6t now already for a while.
I hoped to get rid of this problem by updating the phone to the latest Oxygen OS version - but without success. The problem remains.

Is anyone else facing the same problem and knows if this could be a hardware or softwae related problem?

Thanks in advance

Bastian