Had the exact same problem with my Kindle Fire. All of a sudden I had 30 gigs a day worth of usage. Completely insane. Saw it as an opportunity to finally put together the Debian-based router I'd been wanting to do, and darkstat confirmed that the Kindle was the bandwidth hog. A short traffic shaping script throttled the Kindle to a more reasonable data rate and the problem was solved.
I have no idea what the average Fire user could do in this situation. I found a few complaints across the web of similar problems, and all they could do was shut the thing off and stop using it. Very frustrating.
I have no idea what the average Fire user could do in this situation. I found a few complaints across the web of similar problems, and all they could do was shut the thing off and stop using it. Very frustrating.