I am having battery problems with my Nexus 7. One day while I was using it it just died all of a sudden. The battery wasn't even low, it was at 48%. I thought it might have been a bug or something so I plugged in the charger and waited for a while. The screen just flickers and nothing happens. Finally it turned on but when it did it died again. The only thing that worked was pressing the power and volume down buttons and restarting it from that screen. It has happened multiple times now that my Nexus 7 dies at 48%, no warning or anything, it just dies. Is anyone else having this issue?