I had a weird thing happen to me today and I am wondering if I should take my phone in or not. I was using my phone today (iPhone 6s plus ) and it randomly froze and just shut off. I tried to turn it back on and it gave the battery too low please charge screen which the battery was at around 60 percent so I tried it again and it went back on but then as soon as it got to the lock screen it froze and shut off again. It did the battery low thing a couple times then went back on only to freeze and shut off again. It did this for about 15 minutes before finally snapping out of it and going back to normal. It's now been about 3 hours since the initial incident and it's been fine since. Has this happened to anyone else? Would you suggest this is hardware or software related?