Recent problem – Guess the Code! Review

I have played this game for many years and found it to be reliable, as well as lots of fun. But lately, for some unknown reason, it occasionally shuts down the game in the midst of my play. I lose whatever progress I’ve made on that game and have to start a new one. Please look into this. I don’t see a version number of the game, but it automatically updates, along with other apps. I am on the latest iOS on both my iPhone 7 and my iPad Air. Thanks!
Review by GramSusan on Guess the Code!.