I had almost all my apps set not to refresh in the background. Since updating to 8.1, this setting has been turned on for every app I see. I switch it off, then I go back to look at the settings for that app again and it is switched back on. I restarted my phone (held down home and power button) but that didn't fix it. Any ideas? Might be why my phone battery hasn't been as good since 8.1.