> I've also run into iOS Camera app failing to open the camera.

wow, you just reminded me.

From time to time I bring up the camera app, and I just get a blurry screen. I have to lock the phone and unlock it, maybe quitting the camera app before I get the camera app coming up showing what the camera sees.

I just worked around it and got on with my life and didn't yak-shave (search for a solution or file a bug)