Iphone 6 battery drain during standby

Hello. So I've had an IPhone 6 for several months now which is still under warranty. A few days ago, I noticed that the battery was draining at a much faster rate than usual, even on standby. I think the rate at which the battery drains during standby is the same as when I'm actually using it, but I'm not sure. I thought at first that it was related to IOS version, so I upgraded from 8.1.2 to 8.1.3. No change. As of now I'm running 8.2, but I'm still seeing high battery drain. On standby, the battery drains at a rate of ~10%/hour, meaning I can't take it to work without bringing my adapter too. While charging, I've also noticed an unusual amount of heat.
Another strange thing I've noticed is that, unless I use portrait lock, some apps like Safari will immediately go to landscape mode even if I'm not holding it horizontally, and rotating the phone doesn't fix it. Both of these issues persisted even after I updated IOS, hard rebooted, turned on/off, and did full resets. I also tried signing out of ICloud, but that doesn't seem to have changed anything.
Anyone else suffer these problems? Will probably have the phone looked at later this week.

I Agreed to post an update after the installation of 8.2 .. I have to say that the battery life has shown a major improvement after the update. I also discovered what was causing the Home & Lock screen drain. I went to settings and disable "HAND OFF" it was causing my battery to deplete at a rapid pace. However , I have to ammit that the battery performance still remained better after the update even with Hand Off running in the background.

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<Edited by Host>

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