This happens to me all the time, but I think Grubhubs algorithm is trying to sabotage it own self. I start the day getting orders around the neighborhood and when reject one it starts giving orders 4 to 5 miles away from my neighborhood and it continues on that streak.
So I go offline so my AR doesn't drop. But the customers who ordered in the same neighborhood, I can't get to them because grubhub algorithm is having a meltdown because I rejected one or two.