Screen dysfunction

[Ele28]

When my phone gets warm (when I write SMS, or use it for a long moment), the screens does not work correctly: either it works without any contact, or it works but does not correspond to the point I'm touching. 

I installed the new update, I tried to reinitialize it, it installed Easy Installer then Apk installer to try and open the file touchFWTools.apk but nothing worked. 

I buyed it 3 years ago so it's not guaranted anymore. Is it possible to fix it myself?

Thank you

[Alexander1]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

You can try to reinstall/repair the phone software using Update Service:

http://www.sonymobile.com/global-en/tools/update-service/

Download the program and follow the instructions to proceed with the update/reinstall.