This is exactly what happens to me when the batteries around 10-20%. If I leave it for 10 minutes it will switch on again and the battery isn't drained, it usua

This is exactly what happens to me when the batteries around 10-20%. If I leave it for 10 minutes it will switch on again and the battery isn't drained, it usually switches off when I try to play music or use the map, but not just navigating the phone. I wonder if the battery does just need replacing though, but strange that I have only noticed this since installing iOS7.