why my iphone 6 freezes whenever i miss a call. i have to reboot to gain access

[iMore Question]

whenever I miss a call on my Iphone 6 it freezes. There is no response when I press back, cancel or accept. I have to reboot the phone to gain access.
how can I resolve this issue

 

[Just_Me_D]

I'm not sure, but if it were me, I'd restore the device and then set it up as new.