I'm having a really hard time understanding your questions. Maybe it's language problem or maybe I'm just not getting something. I'm not sure if your radio is 1.2 GHz, 2m, or 2m/440 dual band, so I'm going to take a guess that it's a 2m/440 dual band. Is it possible that your radio is set to cross-band repeat mode without your knowledge, and that it is trying to transmit on 440 when it is hearing a 2m signal? I don't see a radio overheating like that unless it is transmitting. If none of this helps, maybe you can explain it a little more.