Phone over heating?

[Justin9825]

My phone seem to over heat...When ever I'm using the WMWIFI program and my phone is about to die I plug in into the charger and it only charges for about 5 mins then the light starts to blink and it just shuts off and only charges for like 5 mins. I also tried just talking on the phone after that and I had to same problem. Also I tried using the usb cable and just using the 777 method. I still had the same problem. But it has no problem charging just turn on and not doing anything. This never happens untill i'm using my phone as a modem then I have the problem for a while untill after my phone seems to cool down. Is it possible the phone is over heating and can't handle all of the power?