The Words With Friends app is still playing up. The best step to take here is to close the app completely and then relaunch it. From the home screen do the four finger swipe up or double press the home button to reveal your multi task bar. These are all the apps that you have opened at one time. Long press the app until it jiggles and a red minus sign will appear above it. Press the minus sign, this will close the app, not delete it, now press the home button to return to your screen. It's also a good idea to close all these apps, as it helps the iPad run smoothly.
I play this game also and do this step a couple of times a day to be able to keep playing my games. Let's hope the Developer does an update for Words soon!
Sent from my iPad using iPF