Undo doesnt work, App crashes in background

This is a great scoring App, but:
- FIX THE UNDO FUNCTION!!!! With that tiny keypad, input errors do happen. It is so frustrating when UNDO puts the game in an invalid state and has to be cancelled.
- SAVE THE STATE OF THE GAME!!!!!! When task-switching, often the App starts all over, and the game is lost (gone!) instantly. How many good matches were cancelled when I received a phone call or took a photo. SO FRUSTRATING!!!!

Also I dont like the slow compilation of Russ calls, it is way too slow. Especially when playing against the computer.

noshky about Russ Bray Darts Scorer, v4.34.005