Even after I did a hard restart, it did not resolve the issue.

The hardware end button/power button will not end the phone call, it simply will turn off or on the screen. The touch screen end call button works fine.

Pressing the button turns on and off the screen. Holding down the end call/power button will give me a selection for Silient/Flight mode/Power off, like it should, and if I continue to hold it down, it shuts off the phone. So the button works fine. But it is weird that for some reason it will not end a call like it did when I bought it.

Not a big issue, but its just easier to hit the hardware button.

 

It worked good for me. Who would have thought that was an Accessibility setting! Thanks!