The sensors in your mobile device are integral for gaming (try to beat my Temple Run 2 score), as well as many of the basic Galaxy S3 features like Smart Stay and other fancy additions. But sometimes those sensors can become overly sensitive or just downright unusable.
Unless you're a Samsung technician, a faulty sensor could be a difficult issue to remedy. But luckily, most of the orientation issues are due to faulty software and not hardware. There are a bunch of free sensor checking apps in the Play Store, so make sure to check one of them out to see if your sensor really is buggy... more