I have a gear s previously before i change to gear s3. Its fail on me when the touch screen started not to response to touch and to repair it by changing new display is very expensive.
Before display issue, i have a problem with my gear s where its turn of by it self. Although the battery show no dead (with higher % juice its still have) when i turn its ON back. But i suspect the battery is the problem since gear s during that time i already own about 2 1/2 years.
I purchase a new battery online from ebay, very cheap. And change the battery by myself after learn how to do it from you tube.
Result is very2 good. Gear s no more turn off by its self until 3 month later, the display problem happen..lol