I fly with P3D5.2HF default ATC and somehow the frequency for voice comm is always changed by the radio in the aircraft, so I get a message, to change the frequency and then get "did you hear my last transmission". I realized then, it is still the same frequency I set already before 127.650.

Is there some automatic, I have to switch off or is something wrong? When I last flew the classic it was never a problem.
Dan