konami disconnect or hack ?

Hello everyone! I have a question to ask you all any help would be highly appreciated. I recently started playing master duel, I am a long time duel links player, decided to try master duel out . I picked up dragon maids as my first deck . today I was playing a match and was thinking about my play for about 30-40 second and got a disconnect saying I surrendered. Prior to the disconnect I received an in game notice saying that if I an inactive for too long the game will force me to surrender. Is this legit or was this my opponent hacking? Has anyone else experienced this? Thank you in advance!