High data usage by OS Services (on Nexus 4)

Since the update to Lollipop last week, OS Services on my Nexus 4 has been using a really large amount of my mobile data (when I'm connected to mobile data).

I've tried the following actions but the it still consumes a large amount of data (about 150MB for 10 mins browsing):

• Disabled auto backup


• Cancelled auto synch of all my accounts


• Cancelled auto upload of any photos / videos

Any idea which OS Service could be using all this data?

Any help with this would be appreciated, its getting to the stage where I can't use any mobile data as I'm going to go over my usage limit.

Thanks,