Hi. My motorola dext has been working fine since this morning, i realised it wasnt charged the whole night, and when i went to schoool, it had 50% battery, then during recess, it wouldn't switch on, i rushed home right after school and charged it and it says it has 50% battery but it will switch on and off constantly, it will never stay on while charging , and it wont on otherwise. Any ideas why ? or what i can do?