so my tablet that i have been using has been working normal but lately i have noticed that everytime i plug my charger into it (no matter what charger) after a long time of usage, sometimes like 1 hour or more it shuts down and when i boot it haves 0% battery. should i get a new battery or whats the problem? also if i plug the charger in a short time enough it doesnt shut itself only after long time its been used