Server lost connection = ban

I just start a competive game, but after timer goes to 0 - “Server lost connection, trying reconnect and bla bla bla” and after game goes to main menu. Then I press “return to game”, i joined, hears my team voices and in same second i was automaticly excluded from game and get banned from competitive game for some time. WTF blizzard???

Sux bro.

Well how long did you get banned?