Apple India — apple iphone 6

Address: New Delhi, Delhi

I bought my iphone on april14/2017 it is still on guarantee but from last 2-3 months its not working well... Problem is that when i use to listen music then it stop working and get switchoff again open itself then again switchoff and its also starting hang...! I went to service center and apple store more than 5 times but its didn't work... I hope you will take action towards my problem please make it fast as soon as possible because it's create lot of problems... Thankyou