I've been experiencing this more lately, I click the power button to turn it on while holding in portrait mode, it opens in landscape, and remains for a second before switching to portrait. While still on and now in portrait, I tap Mail, it opens in landscape mode while still holding it in portrait. It's been happening more lately since I updated to 8.3. Is anyone else having this issue, and is there a fix? I shut down all apps and powered down/up and hard reset (Power + Home buttons). This fixes it temporarily but it happens again after a few hours. Thanks for any help.