I updated my S6 after months of postponing that 5.1.1 update and basically the notification for the update never went away so I was forced to do it and now my battery life is garbage. Sometimes while the phone is on standby I could lose 10% of battery within 20 minutes. During this time the phone gets really hot and both my wifi and 4G signals are on for some reason. This stops after I restart the phone and my battery goes back to normal (it's still shit). When I'm using the phone, basically for every 2 Snapchats or text messages I send I lose a percent of battery. I've tried factory resetting it but to no avail. What should I do? If it helps, I'm on AT&T.