If you have a Nexus device running a custom ROM, you better check your data usage. A lot of people have noticed a huge spike in data usage on these platforms. The problem might not be limited to Nexus devices, but it is a problem with custom ROMs based on Android 4.2.2 and earlier. It seems to have started around the end of August. Some speculate that Google Services is downloading the Android 4.3 update, which fails since the ROM is custom, and then downloads the update again, etc.
I ran into this problem on my Nexus 7 (2012) running AOKP. This is how I fixed mine (hopefully, so far so good). Note that your device must be rooted, but if you're running a custom ROM, I assume it is.
- Download FOTAKill.apk from CyanogenMod or from XDA
- Move the APK to the /system/app folder (remember to remount /system read-write)
- Change owner/group to root/root and change permissions to 0644 (not sure if this is needed, but I did it to match existing apps)
- Reboot to recovery and wipe the cache
- Reboot and done
Hope this helps someone out there.
