Demoted From Diamond To Plat. Platinum Diamond Master and Challenger are all subject to decay. I have been playing frequently aswell.
Read on for unique insightful tidbits and wisdom. When a player is demoted from Master tier to Diamond. Played another one ended up racking 5 points and got to promoted to Plat II again.
If your MMR is greater than or equal to the Master tier MMR threshold your LP will be set to 75.
My friends in the lobby and I seen the diamond badge on my name but when I restarted my game Im still on plat on and didnt get the RP. Also if your MMR drops enough to where it is in the division tier below your current tier you have a risk of being demoted. I didnt get my RP and didnt get promoted to diamond. I was now 600 looking to play another game to further my RP.