iPad using too much data on WiFi? I am using an iPad 3 (WiFi) on iOS 9.2.1 and since two days I have been having an issue. I don't have an unlimited WiFi connection, I use my mobile phone hotspot for iPad. Now whenever I connect my iPad to hotspot, it starts using very high data, i.e, 2-3 MB every second without any app running. I also tried turning of Background App Refresh, Automatic Downloads are turned off, I tried a soft reset but to no avail. Any idea what's causing this??
P.S: By data, I don't mean mobile data on iPad(My iPad is WiFi only), I mean that it's using the data from my hotspot connection.
Much of iCloud will synchronize when you are connected to WiFi and not cellular data.

Check in the settings app and be sure to turn off iCloud backups (or restrict severely the parts of the data that backup). Also, look at things like iCloud photo library, podcast apps, My Photo Stream and others that wait until you connect to WiFi to avoid burning cellular data.

Can you take it to a proper WiFi temporarily to see if after 30 minutes whatever backup and sync are needed complete and then you will have lower usage going forward?