iPhone 6S is frozen on the "Allow this device to access photos and videos?" dialog box.
My wife's iPhone 6 Plus (iOS 11.2.5) is frozen on the "Allow this device to access photos and videos?" dialog box. I can select "Don't Allow" or "Allow" -- although neither option makes the dialog box go away. I can't power off the device because the "slide to power off" button doesn't recognize input. I can't open the device to change settings, etc. because Touch ID is requiring the passcode, which can't be entered while the "Allow this device . . ." dialog box has focus and is blocking the numeric keypad. I'm stymied on this one. Any thoughts on resolution? Thanks.
iPhone 6 Plus, iOS 11.2.5