Xperia M2 touchscreen doesn't work in the middle area

[Askario214]

Here's obvious proof

                

D2303, Kitkat 4.4.4 ver. 18.3.1.C.1.15, depends on nothing.

[Phy]

Have you tested the screen? 

1. Settings 
2. About phone
3. Diagnostics
4. Test
5. Test the screen

[Askario214]

The same problem, yellow line is  interrupted in the central area.

[Phy]

contact Sony xperia support, that seems to be a hardware issue.

Sony Xperia Support.
http://support.sonymobile.com/global-en/contactUs/