I have also experienced issues with my iphone5 since updating to ios 7.1.2, prior to this update my phone was working perfectly fine and I know I didnt cause any damage to the phone because I baby my iphone as if it was my child. Ever since I updated to 7.1.2 my phone shutts itself down while I am using it, it can be while using whatsapp, browsing the internet or using apps, more than anything it fails while using the internet. The screen will either start to flicker or vertical lines will pop up and then the phone will fade to black, after this happens the phone will get really hot and to turn it back on I have to wait 5-10 minutes and hold down the power and home keys at the same time for about 15 seconds for it to turn back on, I have to wait 5-10 minutes because if I dont when I boot it back up it immediately shutts down again. This is a constant all day thing and for now i get by just making phone calls and sending regular text but I try to keep the action down to a minimum to prevent missing a phone call. I tried clearing the phone and rebooting it to original setting but this didnt fix it. After reading and speaking with several techs they tell me that ios 7.1.2 rolled out some performance adjustments one particular that affects the amp levels that the battery works at and supposedly the iphone 5 cant handle it, they explained that the phone for certain activities is asking for more or less power and the phone panics into safe mode and shutts itself down. My battery life is fine so I havent changed the battery like someone had suggested. In the diagnostic data it gives a panic.ips error. Id really like to know if there is any possible way to roll back to 7.1.1 through jailbreak or any other way, I was perfectly happy with this phone and didnt plan on buying another one for atleast 1-2 more years. If anyone can help me out this would be greatly appreciated, if not I hope apple is working to fix this.