lagcats

Hey, So when i play the game the game crashes sometimes when i reveal a letter and reads it or when i use Accio on flying letters and reads it the game crashes. I got a good pc with good speccs so it has nothing to do with that. On my old pc this never happened. What could be the problem? It's only when i reveal a letter and presses "F" to read it the game crashes or when i use the Accio to read the flying letters. Really need some help on this cause i can't really progress and level up if this is an issue :O