My iphone hangs any time.I see a call coming but i cannot attend. My call drops anytime and i cant even end the call.The settings page doesnt respond many times.I have given the phone to Apple care , they update the software and return it back to me

My iphone hangs any time.I see a call coming but i cannot attend. My call drops anytime and i cant even end the call.The settings page doesnt respond many times.I have given the phone to Apple care , they update the software and return it back to me.IT WORKS FINE FOR 3-4 DAYS AGAIN THE SAME. Its under warranty and i am disappointed with the Apple product and service

If you used your backup to restore the data after it got returned, set it up as new device and don't use the backup data afterwards. It seems that some data inside the backup are corrupt. Follow this article and set up the account info and other setting manually after that:
Use iTunes to restore your iOS device to factory settings - Apple Support

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