This has been bugging me-- Sometimes I unlock my iPhone 6, i found the phone, with the previous app I opened, stuck at the landscape mode, even the phone is in vertical. The only way to go to the portrait mode is to close and open the app, or put the phone back to horizontal and to vertical again. I don't know if it is the phone or the iOS 8.1.1. Do you guys have the same issue? I thought i found out it happens when I lock the phone with the app in the landscape mode. But then I realize it happens regardless. It happens to Pages, iMessage and mails. I hope it is just a software bug, not the phone issue. It happens randomly but quite often.