This is the 2nd time my arena rewards change mid timer. Both times have been around the 20 min. remaining time. Start with a Gem Stake and at the 20(ish) min remaining they changed to a chest stake. Now if it was just crappy xp or something I would not care but GEMS? come on. Fix this please.

(note: there were not stollen via arena loss. When I get gems i watch the timer to make sure i dont miss so I am possitive they changed rewards )