Continuous data use icon Wifi or T-mobile ???? anyone else?

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I'm noticing that my GS3 is almost ALWAYS downloading something according to the data activity icon in the header. The down signal is just about ALWAYS on. I've removed the home screen crap that was on with the exception of the default clock/weather widget, which is set to refresh once an hour. All the t-mobile widgets, flipboard widgets, s-voice widgets... I trashed them off the various home screens.

My email app is set for push....?

I'm little confused and wondering if this constant downloading is what is eating my battery. You can almost HEAR the sucking sound of the battery drain

This is bad. And I need some help. Is there a way to see what is accessing the data ?

It's been hours and my wifi or mobile data is continuous up/down on.

Battery down to 50% after just a few hours.

Something is doing "something" in the background, and I don't know what.

Sent from my SGH-T999 using xda app-developers app

Using Network Manager, I've isolated it to K9 MAIL... was draining the battery LIKE CRAZY. Had to go to settings and set sync to never - now I'm not being alerted to emails.