Sound doesn't work consistently – Sight Words Ninja - Slicing Game to Learn to Read Review

I can't get the sound to work consistently on any of our I phones or I pads. The only way I can get it to work temporarily is to go in the parent settings, access the word list and play a word. Then the sound will start working for the game until we close the game. The next time we open the game it will not work again unless we go through the same procedure. This is too difficult for my toddler to do on his own. Please fix.
Review by Ajk5 on Sight Words Ninja - Slicing Game to Learn to Read.