Just started in the last few days. I am on 4.1.1, unrooted. Battery has started dropping more during the day than it used to, as in 20% when it used to drop only 5%. I leave WiFi on all the time (I know about the drain when you turn it off) and I am usually connected. When I look at what has used the battery, it is mostly Network. When I view data usage by aplication, it is mostly Play Store.