Grandmaster Crystal odds for 5 star champions appears to have been greatly reduced
I have opened 148 Grandmaster crystals. In the first 71, I received 4, 5 star champions and 8, 4 star champions. For the next 77 crystals I received 0, 5 star champions and 8, 4 star champions. Is there a bug? Were the odds for 5* greatly reduced in the past month or so? It seems to have definitely changed for 5 star champions. Can anyone confirm this? I might as well not waste any more units on Grandmaster Crystals if this is true. 77 Crystals (15,400 units) down the drain.