Apple iPhone 6s Plus screen error
I'm using a iPhone 6s Plus and have had some serious issues with the screen "portrait orientation lock". Even though I manually lock the screen to portrait, it keeps going to landscape mode and sometimes "forgets" itself on landscape and won't react to any shakes or turns until I restart my phone. Third party apps that are in portrait, run as intended, but after exiting them, everything else is landscape again.
Starting to loose my cool on this already, especially when you need something fast or I am behind the wheel and want to have a quick glance on the e-mails.
iPhone 6s Plus, iOS 9.1