Hi guys i had bought my Z1 about 1 month ago, everything is great until 2 days ago i found that when im trying to unlock my screen, the whole touchscreen is not working, like virtually cannot sense my finger touch at all. The phone is not hang becoz the power and volume button are still working. in the end i need to use the force turn off (hold power + volume up). After a while i restart my phone again and the touchscreen is working.

The problem occurs once in a while and everytime i need to restart my Z1. this problem normally occurs when i am playing candy crush. Yesterday i cannot stand it anymore so i did a format and reinstallation by using the Sony PC companion. After the screen was ok for one day, and today the problem started again.

I am wondering anyone of you experienced the same problem as me? FYI my phone is on the latest version already. i don't have many apps in my phone, just facebook, watsapp, candy crush... and some common free legal apps.

If anyone knows how to fix it please tell me? Thanks in advance.

tried it and its still the same issue. reset to factory setting without installing any app. after a while still touch screen not responding. going to claim warranty. Hopefully they will give me a brand new phone.

Thanks for your suggestion by the way.