If you shut it down and start it back up right away, are the sounds correct? If so, it is not a temperature related issue, it's a software issue. I have an AF piper with PS3. When I got it, several of the sound effects sounded like static. Some of these effects sequence when the engine has been idle for a while. I used San Diego Mark's sound editing tool and found that the specific sound effects were loaded with the wrong sampling rate designation in the file. There are two sampling rate types. All I did was change the type designation in the file and reload it to the engine and everything worked.
You could try a different sound file from another PS3 400e. Save the one you have first.
George
