I have had my 3GS since the day they came out. I never had a problem with it. Right now I would not consider this a problem, just an inconvenience. I had a 3G phone that I bought a couple of days before the 3GS announcement. Since I got it through AT&T I was able to return it and get my 3GS. I kept all the accessories from the 3G, one of which was a car charger. The phone always charged fine. Today I went on a trip and used my Navigon app with the phone on the charger. When I left the phone was not completly charged, but I don't recall the exact number. The trip was 90 minutes. When I arrived my battery was completly charged. I used the phone for a couple of hours off the charger and it was down to 45% charge. On the ride home it was back on the charger and using Navigon I noticed it was loosing charge. By about 3/4 of the way home I was down to 34%. I turned off the Navigon app and the phone started charging great. I guess the Navigon app uses so much power that if the battery is below a certain percentage it can not recharge.