You can call up your recent games and re-visit the incomplete one and resubmit it to keep your 100% solve rate intact. (I think you have up to 24 hours to do this) - You find it in recent games on the top right. Your average time will still take a massive hit.
My average is low because of this - I have had a fickle internet connection in the past month or so, and have had four puzzles which I could not submit until the next day!
