"Lost promo due to inactivity" and I wasn't inactive. Major bug.
I was in my series to move from B2 to B1. I won 1 game, and lost 1 game. After the loss I took a 15 minute break to take a shower.
When I came back there was a little pop-up saying my ranked series had ended due to inactivity.
I checked and my promos were over, and I had 20 less LP.
That is a terrible bug. Please fix it.