I have stock unrolled s5 with Android 6.0.1. When I receive a call I get the "phone has stopped working" that keeping appearing. The only way to stop the error message is to restart the phone. This started happening after a upgrade earlier this year. Have resetting the phone and wiping the cache partition. Contacted Samsung and their solution is to send the phone in.. Wiping the cache patition works temporarily. The odd thing is that this is a random problem.