Why is Angry Birds 2 always freezing or running slow ??

Hi everyone can anyone help please....? When I am playing the daily challenge or the arena the screen freezes and I have to shut the game down and restart the game losing a life and any pizes I have won. Also when I  fire birds off they sometimes fly in slow motion or freeze in mid air. It is not my Iphone X as its new and has still over 60gig of memory to fill, is this a clitch in the game and is anyone else having this problem ?
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