BDP3200/12 audio problem when HOT

BDP3200/12 connected to an old TV with a coposite cable (yellow,red and white), and connected to a Dolby sorround amplifier using the coaxial cable.
As the temperature grow, the BDP3200 become HOT in the bottom part (if I touch I think it's 60°C) and after 1 hour of film the audio is missing, come back, miss again ... The same problem using BR/DVD/DVX source. No problem ti the video.
Why is this so HOT? Should I use Coaxial OR analog audio? Should I use the optical cable to reduce temperature growth?

Is it possible to have a inside picture of the BDP3200/12 just to understand what is the part becoming hot? Maybe is the audio chip or the alimentation section .. don't know until I don't open the player

Thanks

To have temperature differences between different connections is not the case.

Please keep in mind that it is important where you place the device, well ventilated and not squeezed into a cupboard where there is not a lo of ventilation.

where is this one placed??

yes, agree with Oscar. Should allow some more space at the back and for the sides for ventilation.