Lost connection mid game


hey guys
I dont know if i should post it here or elseway so I try my luck.
yesterday mid game, actually in the final 10 seconds of the match, your server kick me while playing.
it happend without any reason while chatting with my party in the blizzard social feature - which shows that I didnt lost internet connection.
unfortunatly that “cost me” 9 minutes ban and losing SR instead of ganing it as it was in the last 10 seconds.
hope you could help me understand better the situation.