Phone freezing and unresponsive

[indu21]

My xperia z3 which was bought a week ago suddenly shows grains on the screen like when a tv shows when there is nothing played on screen. That time the phone is unresponsive. It turns back to normal after 5 minutes or so. What could be the problem.? Pls help.

[Thommo]

Try performing a system repair using PC Companion as this will often fix issues - This will factory reset your phone and erase all data so best to backup before you begin

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP

[Uliwooly]

Don't forget to backup

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355