I have turned everything off - automatic everything - background everything. Every time that my iPad 3 is plugged in and locked and on wifi my data starts draining. When I unplug it, it stops. This is driving me crazy! I updated to 8.1.1 last night during my ISP free time. I thought the update would help as this started with the previous update. I did not stay up to turn it off when it was done. When I checked it this morning it was down to 364mb from 500mb. I finally unplugged it when it got down to 227mb. Please help me figure out why this is happening.