Skyrocketing Data consumption

Hey Folks,
My ISP is showing that I am exceeding my bandwidth cap this month.
When I checked the history, I noticed that it has been jumping 25G month to month.  (since I replaced my cable modem)

I think something is wrong with my cable box as i can track my usage on my time capsule (loosely) and on all my devices except my APTV.
I cannot account for any more than 20GB of data usage for all of them. However, because I am about to hammer the provider, I am just making sure no one else has noticed any random running processes from the APTV that would consume large bits of data.