Lenovo — smartphone hanging

Address:

Thane, Maharashtra, 421503

Hi,
I have purchased lenovo k6 power smartphone on 25/06/2017) from just talk mobile gallery badlapur maharashtra. Recently within the week it starts hanging issue and some time touch pad not working while receiving incoming call.
After using this phone for around 9-10 days, i am facing some issues with it. Screen suddenly goes dark or freezes and remain like that till i press power button for 5-10 seconds. It happens twice or thrice a day. I done use any big app or game but still such kind of issues are frustrating. Please provide some solution (Other than visit to nearest lenovo service center).
My mobile no. - [protected]