At 120 days, games become unranked and further actions within the round means nothing to your stats (but gold payout will still change based on VP's owned when the game does end)
If no other players exist in a game, the game will unrank after 14 days. This means a 10p map where five players have lost outright, and another four have simply gone inactive (or however you get down to one active player) will not continue to count towards your stats after 14 days of you playing by yourself.
For one of these two reasons, your game's ranked period will end in 7 days.
Do not worry, the stats for the ranked portion of your round stay yours. Any medals you had earned will still count, and when/if the round does end, you will be paid out gold: per VP held * [round modifier].
Hope this clears up the message for you 
