I ran my battery down to 0% it turned off automatically...but took over 20 minutes to turn back on...I was using my older iP4 charger. Does the iP4s charger have a stronger output?? Anyone else run into this issue?? Also I went for a nap yesterday, turned on my timer, woke up half way through and was going to turn off the timer, when I pressed the home button, my phone showed the apple logo, as if it powered itself off and on...the timer was still running when it finally turned itself back on.... Anyone else??