In the middle of a movie it quit. It started making a sound, as if it was continually trying to restart. I shut it off to see if recharging it would work. the light started flashing green & red. After a while the red light stayed on. After an hour or longer I tried to finish my movie. It began to work properly for about 5-10 minutes, then shut off and began doing the same thing. I could not get the back to come off, to see if I could replace the rechargeable battery. Please Advise!