notification bar unresponsive on homepage

[Wawaw]

good day people.

i have a problem with my xperia Z2. i've been on the net for hours searching for the answer but all they've said was  just to soft restart it which i did but to no success of fixing it.

i updated my phone from kitkat to the new android lolipop. everything went fine. everything was great. but suddenly just this morning a problem concerning my notifcation bar arise. 

my problem is swiping down my notification bar. it works fine on the lock screen but when the moment i unlock my phone, i cant easily swipe it down. i have to linger my hand from the top bezzle slowly swiping my thumb so that the notification bar would respond. i dont have all day to do this. i tried activating the show touch option to see how my touch responded to the screen. and there i think is the problem. there is this small gap between the bezzle and the top screen of my Z2. 

now the tricky thing to this problem is, why would my lockscreen-notification-bar-swipe work but my homepage swiping of the notification bar wont? they have the same gap of the touch between the bezzle and the screen when i touch the upper most part of the screen yet both work differently in terms of the responsiveness of the notification bar. please do help. 

[Thommo]

I noticed this and found that if I unlock my screen then swipe down straight away I have this issue - If I wait untill the home screen loads fully which takes only a few seconds the issue is resolved

[Wawaw]

even in any other apps. it still wont work. only on the lockscreen T_T

[Thommo]

Maybe 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

[Wawaw]

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@Thommo wrote:

Maybe 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

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i did as what you specifically said and yet the problem is still there.... i had it backed up. as soon as the phone went on, the first thing i did was swipe down the notification bar on the lock screen and still it works. but homepage notification bar still unresponsive. what to do?