I have been experiencing this as well, however, now one of my four games will cause the app to crash preventing me from loading that game entirely. The other three are working fine (aside from the random chat crashes).
It happened when I select said game from the "Your Games" menu. Only affects 1 of 4 current games. Still receiving push notifications from game in question, but last few came all at once instead of when they actually happened.
When game is selected, begins loading screen, then exits to my home screen. App is still open when I double click to view open apps.
Hope this helps! Otherwise this is a great game!