[Solved] Android OS extreme Data usage.
Anyone noticed any recent abnormally high background data utilisation from Android OS (both wifi and mobile?).
UK XT1032, 16GB stock unrooted Tesco firmware currently on 176.44.1. Hangouts, Migrate, Google+, Google Play Music, Google Play Movies & TV, Google Play Games, Google Play Books, & Chrome all disabled. Google Backup and Automatic Restore are on, all of the other Google Services set to Sync automatically. I use Firefox as my browser (with a sync to my laptop Firefox).
I've looked back on the data records for my phone and it looks like the problem started around the 25th of February. This roughly coincides to the last OTA to 176.44.1 which I'm pretty sure I got on the 26th or 27th. The most recent Google Play Services (4.4.43) installed on 1/3/14. The only other thing I can think of is K9 Mail which I installed on the 24th, although I'm struggling to see how a User app could show data used under Android OS.
I've checked my other half's Moto G (8GB UK version - O2 variant, stock unrooted) and she hasn't got this showing up at all. I've compared Sync/Backup settings between the two phones and they are the same, and other than Chrome she has pretty much the same stuff disabled. She doesn't use Firefox, and uses the stock email app with an exchange account.
16/1/14 to 13/2/14 - 311MB (so about 11MB day)
13/2/14 to 25/2/14 - 71.2MB ( about 6 MB day)
25/2/14 to 13/3/14 - 0.93GB ( about 55MB per day)
15/1/14 to 15/2/14 - 70.19MB ( about 2.5MB per day)
15/2/14 to 25/2/14 - 21.14MB (about 2MB per day)
25/2/14 to 13/3/14 - 275MB (about 16MB per day)
Possible solutions to try
1) Get rid of K9 email for a while (I use it because the stock email app appears to be incompatible with my talktalk.net ISP email account - it receives but can't send).
2) Cache Wipe in Recovery (although I'm pretty sure I've done this once since the last OTA)
3) Remove and then re add my gmail account.
4) Factory Reset.
Before I commence anyone else experiencing this problem, or even better has had the problem and solved it!