Not sure why, but for me the Siri enabled button is very finicky. I'll turn it on and it doesn't stick, etc. I figured other people found a work-around to enable it...
So a free a few flips back and forth and experimenting on when to exit that setting, it now finally sticks on.
It's the only setting I've seen so far that gives me problems (flashes back off immediately when flipped on, reverts to off after turning on and leaving settings screen).
Has anyone else had to tease this setting to get it to work?