So I have been noticing that when my wifi sleep policy (set to "never") has not been working correctly. When I'm connected to my wifi and the phone times out and goes to sleep it turns the wifi off and connects to my mobile data again. It's not a huge deal that it is using the mobile data (I have unlimited) but it's my understanding that the battery life will be better if connected to Wifi rather than searching for mobile signals. I've searched through the forum and haven't found anything that helps so I figured I'd post it. Sorry if I missed it somewhere.