Graphics don't load completely then game freezes

When I play OW2 sometimes the game freezes. Last time was when I played 20min ago. Some of the graphics didn’t load.
Some characters where just blue sprites.
Their health bars where black.
The HUD was gone.
When this problem occurs, it takes about a minute, then the computer freezes completely.
I managed to rejoin, last time, but the problem persisted. Even thou it was a clean start of the computer and game.
I have had this problem on a couple occasions previously. Now I am band for the season?? So I’m of to rivals now, with my friends. Please fix this, I was looking forward to stadium:-(