When I recruited my first hero the congratulatory banner popped up saying level 0 but there was also text hidden behind that was illegible (layering issue). Happened again when I bought some premium gear. Weird banner and layered text.

Middle of game lag spike: "An error has occurred. Going back to main menu. (3397432595)

How To Play> Practice in Game>brought me back to main menu and said something about not being the group leader even though I wasn't in a group.