Dear Samsung Member,
Greetings from Samsung Customer Support!
Please be assured and to resolve "touch" issue kindly follow the given below step:
>>Check device in Safe Mode:-Press and hold the Power key, when Power off icon appears > Press and hold the power off icon.
To exit safe mode:-Restart your device.
And to resolve "Battery drainage" issue kindly follow the given link: http://www.samsung.com/in/support/skp/faq/1101689
If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report/ask question).
Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
Thank you for writing to Samsung.
Samsung Customer Support