I used to have an iPhone but my brother had dropped it in the toilet and it wouldn t open after that. I was given an old Samsung Galaxy s3 since my family didn't have enough money to buy another new phone. It worked absolutely perfectly for 6 months and all of a sudden it has been going crazy. About 2 months ago, the off button on the side stopped working by itself and I would have to keep the timeout at 15 seconds. When I remove the battery to shut it off, it would go to the Samsung screen, shut off, and vibrate every 5 seconds. I would slap it to open it since for some reason it would open. Yesterday, I removed the battery and put it back it and it opened without me slapping it, but it shuts off by itself every minute. I kept trying to remove the battery and put it back in to open it, but it would still turn off by itself after a few minutes. What do I do about it?
Read more: What do i do with my samsung s3? Why does it keep acting up?