Lobby kicks me for being afk?

Hi

After coming back to sc2 I noticed a weird bug where for some reason when I join an arcade lobby and minimize the game while I wait for the game to start, that for some reason when I re tab to sc2 it says I have been kicked for being afk, but I am not afk, I am still at my keyboard. Pls fix, very annoying

It’s not a bug, it’s a feature.

I remember it being in game back in 2013, so probably was with the game since early WoL times.
After a few minutes on alt tab you should come back to have a look at Starcraft and make a click or two, should be enough.