(This is supposed to be in the troubleshooting section - apologies) My iPhone 6 was on 1% battery, plugged it in charger, a few seconds later it crashed. The Apple logo came on. The logo stays there for a while then turns off, it does not loop. I even timed it. When I turn on the phone, Apple logo stays on for 2 min 35 secs until the phone turns off. I tried a hard reboot, still no luck. I’m using a jailbroken iOS 9.1 I had a similar problem 6 month ago, but it kept looping, and I was able to simple solve the problem using the No substrate mode by using the volume button. Now that's not working so I do not think it's a jailbroken iPhone issue. Also, I haven't installed any tweaks recently.