I have been having an issue with my 32g 5s (Sprint) restarting randomly, sometimes with the blue screen, sometimes with the screen just freezing, including a couple of times when I got the restart loop. This morning, I went to wake it to use it, and it had turned itself off, I'm assuming after entering a restart loop. I am running iOS 8.1. When I installed this version of iOS, my phone went to restore mode, and I decided to not restore from backup and do a clean install, hoping it would fix the issue. It hasn't. In the beginning, it was only happening when my phone was on the charger. The last couple of days, it's been happening both on and off the charger. I'm guessing this might be a hardware issue, but is there anything in the Diagnostics & Usage Data in settings that could give me some insight? And is there any sort of good resource out there that can tell me what that diagnostic info means? I bought the phone at a Sprint store, so I would guess I'd have to go there and make them replace it if it is, in fact, a hardware issue, so I want to have sufficient ammo to throw at them in order to get that done with no money out of my pocket.