Bug/Issue when saving the game freezes

hi guys
i bought the game yesterday (iphone version)-Iphone 6 plus
i am having a problem when i go to bed in the game and start to show "saving" it seem like freezing and doesn't work after that with the screen showing the word "saving" and dots beside it moving and all the screen is black..
i have to close the game and open it again in order to play with an old save recovery ..which is exhausting .

it did that several times ,not always but it is frequent ..so can you help me with this ,please?

 

Seeing the same issue today with the just released version 1.12