Xperia Z2 :: Phone Status Bar Not Sliding Down

I bought xperia z2 2 weeks ago. Just today my phone went crazy. The screen started detecting random touches every where _ghost touches_. I switched it off several times until the problem was solved . But apparently a new problem appeared. Now I can't scroll down the notification bar. I went to diagnostics where I could test the device. I tested the touch input and surprisingly the status bar area detects nothing at all. The screen works responds properly except for the upper most part ( status bar area). So I guess that this is a software problem .