The other day after my phone had been unplugged for less than an hour it buzzed and told me the battery only had 5% remaining. Which is ridiculous considering my phone charged overnight. So I turned it off and back on, then everything was back to normal. Just today it has happened again, said there was only 5% battery left. This time in the middle of the day. Haven't used it any more than usual and it should have around 80% charge. So I again turned it off and back on, and it now says 100% charge. Certainly this can't be right either it should show less than 100% but certainly way more than 5%. Anyone else seen this before?