Respawn Entertainment responded fairly quickly to a Reddit post showing a rather annoying glitch in Arena mode. Redditor Fish_Smell_Bad posted the clip titling it, "Get this to Respawn ASAP. There is a bug in Arenas mode right now that lets you crash the server by pinging your ultimate. I'm posting this because it's going to be found eventually and I might as well let the devs know immediately."
To explain the glitch, when players have the bug that won't allow them to ping in general, if they then ping their ultimate it will crash the game for everyone. That would explain why everyone else can ping their ultimate without a crashed game.
Then a Respawn developer commented, "so.... firstly, we are currently deploying the hotfix for this as we type. Thank you for bringing this to our attention. We've been trying to be downlow and intentionally not responding to this issue, because acknowledging this is going to put eyes on this exploit. Doing so will cause more pain for everyone while the hotfix itself is being prepared, which takes a few days to test on all platforms."
It's a rather sad situation that Respawn has to keep the glitch on the downlow while they attempt a fix in case players try to use this bug on purpose and ruin player's games.