I keep my phone plugged in over night so it can charge and I also keep it next to me since it's also my alarm clock. So I woke up this morning to my alarm going off and I saw the little red light lit up. I looked at the phone and it showed that it was in fact charging and it was at 5% batter life. I unplugged the phone and it stayed at 5% but when I plugged it back in, it shot up to 60% and the light turned off. It showed as charging again so I unplugged it once more and replugged it back in and it went all the way up to 100% and stopped charging. This was 4 hours ago and right now everything seems fine and my phone still has a full charge. Has this happened to anyone else or does anyone know what could have cause this to happen and if there is anything that I should be worried about?