Re: my galaxy s plus shuts down when surfing the internet with 3g
Welcome to Android Central! Is it powering down completely, or is the screen just going to sleep? Does it only happen when using a browser? What about when using other apps?
Try booting into Recovery Mode and wiping the cache partition, which won't erase any personal data. Follow the steps in this video, but instead of selecting Wipe Data/Factory Reset, make sure you select Wipe Cache Partition. When complete, then select Reboot System Now.