Please perform the following steps to resolve above mentioned issues:
For battery drainage issue follow the given link- http://www.samsung.com/in/support/skp/faq/1101689
For heating issue follow the given link- http://www.samsung.com/in/support/skp/faq/1119803
For further assistance, register your concern in Samsung members application (Open Samsung members app > click on “+“icon > send feedback > error report/ask question).
Team Samsung Members