Numbers on my iPad 4 sometimes don't work since I upgraded to iOS ten

[iMore Question]

Sometimes if I wait a while the problem goes away but it is happening frequently enough that it is annoying and sending emails takes longer than it should.

 

[anon(153966)]

Try resetting the device, i.e. hold both the home button and power button till you see the Apple logo.
After it restarts, see how it acts...