Not quite sure I have heard of this error, do you have a screenshot of when it happened?
The only known error messages related to internet connection issues are “Lost Connection to the Server” which appear on the title screen during a full fledged disconnection, and “Failed to Connect to the Server” which appears in the text chat dialog on the game client and simply prevents you from connection to a game you were matched to but you do not lose connection to the overall game client.
So basically, the penalty still stands if you fail to report back to the match within two minutes, this is because by that time your teammates are granted the option to forfeit and leave without suspension (and take the normal SR deduction for a loss). More details on this policy can be found here: