Droid Turbo 2 keeps hanging up calls

[AC Question]

I just activated my Droid Turbo 2. When making or receiving calls, the phone keeps hanging up.

 

[BattleSwine]

Do you have advanced calling turned on? If you are in a weak LTE area dropping down 3G will dropped calls?

 

[B. Diddy]

Welcome to Android Central! Also, is your overall cell signal strong?

When you make or receive a call and have it up against your ear, is the screen turning off properly (to prevent your face from accidentally pressing any onscreen button)?