Why in Alphabetty Saga level 297 do the letters shuffle at radom & restarts on its own?

The game auto-reshuffles when there is no acceptable 3-letter or longer word that the player can possibly obtain on the board.And I *think* I recall that if the result of the auto-reshuffle is again a board without acceptable words, the game reshuffles again - up to a 3rd consecutive failed reshuffle, upon which the game quits and you lose one life.

I want to add that at this level i had 8 more moves and 1 word when the game closed.  This has happened several times.