Rivals not working

That's happening to me as well because if you have Trailblazer Slide Tackler or Trailblazer Interceptor Evolutions in your starting 11 the game will drop every time playing Division Rivals or Champions.

Evolution players lose their base playstyles and somehow get bugged that they now aren't working online.

If you remove them from the team the game won't drop but that defeats the purpose of doing evolutions in first place.