Happens mainly when an app (like MLB At Bat) uses 3G. I can see battery level drop like a rock (maybe 20 points in 10-15 minutes). Heat is felt in camera lens area, but camera use does not generate heat. Also gets hot during a longish call (4-5 minutes) but these are rare for me. It's definitely not a battery thing - battery is cool when pulled from hot phone. I use the DATA ON/OFF app (which controls 3G) and phone cools when I switch data off. Had the phone maybe 8-9 months before I noticed this. FWIW I have preferred network set to CDMA auto (PRL). Can anyone help?