OnePlus X - system UI has stopped

Hello everybody,

I receive the message "system UI has stopped" when I rotate the screen.
1.) I click on the "ok" button to get rid of the message
2.) The phone goes to standby modus, I need to enter my pin to unlock the phone
3.) Home screen is shown, it's not possible to enter the task manager, touch button on phone doesn't respond
4.) After some time the touch button responds and I can close the application

Technical details:
Paranoid Android version: 6.0.1
Security patch: 1 May 2016
3.4.0 eXcaliBur+paranoid@92.hostingsharedbox.com

Any ideas how to solve this problem?

Best regards,

Rob