@Khalid722: To be clear, does your phone become unresponsive when you rotate it to Landscape mode? If so, does it remain unresponsive, or are you able to return functionality to the device by rotating back to Portrait mode? Does this issue occur while using certain apps, or is it persistent across all apps that support Auto-rotate?
To troubleshoot the issue, please restart your phone in Safe Mode, as this will disable all third party apps and help to determine if the problem is stemming from an external source. To enter Safe Mode, press and hold the Power button until the 'Power off' prompt appears on the screen then release > Touch and hold Power off until the 'Safe mode' prompt appears then release > To confirm, tap Safe mode.
If you notice an improvement in performance while Safe Mode is enabled, then please restart the phone as you would normally and uninstall any recently added applications. Sadly it won't be possible to tell which app is the source of the problem, therefore I recommend approaching this via a process of elimination. Let me know how you get on.
