Hi! I have a Galaxy Tab 4 which worked perfectly until one day I (as usual) charged it to 100% & since then it would start overheating from the top left of its back and battery drains so quickly! I have only ever used it for reading books and kept it safe always -- normally my battery would last for at least a week. Also note that my charger (adapter) was strangely overheating as well while charging it -- need help please.