Is this why servers are down?
https://boards.na.leagueoflegends.com/en/c/developer-corner/mzMOBQXp-teamfight-tactics-dev-update-ranked-changes too many people going from challenger/gm to d1 for 1 bad match?
"Moving forward, when you lose LP while at 0 LP in GM or Challenger you'll immediately be demoted to Diamond 1. One last note—we're making this change across all ranked queues, not just TFT."