After upgrade to iOS 10, the alphanumeric selection button (e.g. [.?123] key) doesn't always work. Most of the time, it's fine, but once or twice a day in different apps it stops responding. I've noticed it when using Notes and Mail, mostly. The key doesn't respond to being pressed, using either the left or the right key. Splitting and then re-merging/re-docking the keyboard or quitting and restarting the app seems to fix it. Any idea what is causing this?
