Phone automatically locks while using it after having set the lock screen options once
When you install Plasma mobile the options "Lock sceen" and "Turn off display" are set to never. When you set them 1 min, the setting will cause the phone to be locked while you are using it. When you unlock it again, it instantly locks again. This makes the phone unuseable. Even setting this option back to "never" doesn't fix it. This is the second time this is happening to an installation and it always started after I set these values.