Happened three times, twice during competitive matches, once in Training room. All three times I was playing Mercy, two freezes happened at the end of Valkyrie (while holding Blaster) and the third freeze happened from a death. I was able to hear in-game sounds all three times as if I was still playing the game (could hear voice chat as well). Still, the game froze on these occasions and couldn’t respond to anything but Alt+F4.