There is a problem with using Zwift on the integrated graphics within 10th and 11th generation Intel processors, which causes the game to freeze randomly. It seems like that’s the problem you’re having too, so Gerrie has moved your post and mine into this thread. In the post I’ve linked to are a few other links where people have rolled back their Intel display drivers and the problem has gone away. You should give that a go, because as far as I’m aware there’s no fix from Zwift at the moment. 
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