My phone is a LG Optimus Elite ( android). my phone was one 1% and it shut down. then when i turned to back on it was on full bar. then 1 min later it went to yellow when it was just on a full bar. then it goes to red and turn off. and one time when my phone was on full bar it automatically went to red. i did nothing to my phone can somebody tell me whats going on ASAP!