I purchased this phone in July 2013 and it does not have Applecare. This problem started one week ago. My phone will suddenly freeze and resets, and it tends to happen when the screen is on/being used for 10-15 minutes consistently. For example, it has occurred during FaceTime calls, camera usage, and Internet browsing. It has not happened during audio phone calls or simply listening to streaming audio with the screen off. The phone will freeze for a moment, then usually the screen will briefly get distorted (black lines/black bars, sometimes part of the screen changes color), and then it will instantly reset to the Apple logo. Sometimes the phone resets several times in a row, not getting past the logo, until it's back to the regular home screen. I did not make any changes to the hardware just prior to this issue, nor did I install new software. I did upgrade to iOS 8.3 shortly after it came out. I also did a full restore twice: once at home and once at the Apple Store (normal recovery mode, not DFU mode). I suspect this may be an overheating problem. Could it be a faulty battery? The current battery was replaced under warranty in June 2014. I took the phone to the Genius Bar, and they recommended a phone replacement (at a $269 cost). They said the battery passed the diagnostic test to check its capacity. The only thing the Genius saw in the logs was the app crashes, which happen when the phone resets. Here's my question: Does anyone think I can do anything to remedy this before I bite the bullet and replace the phone? Is it possible that the battery is causing the phone to overheat? Any other suggestions? Thanks in advance for any and all help.