Xperia z gone really laggy and slow suddenly

[saabuldin]

Hi, ive been using my xperia z with kitkat for a while now and suddenly its become very slow and laggy. Even after complete reset twice, its still the same. As im typing this on the xperia z. The letters come on screen a second after i type. Thia happens in every app i use. Scrolling gone laggy as well.

Another thing i noticed is when i watch a youtube video which has been embedded in artical for example some articles on feedly. Video has gone laggy there as well, i have to put it to full screen for it to play smoothly. It was perfectly fine before.

In conclusion, tbe whole phone has gone slow and laggy and even a factory reset doesnt fix it. What cN i do?

[Uliwooly]

@saabuldin

Does this happen on Chrome or other apps? 

[Phy]

Do you experience the same lag and issues while on safe mode? This is how to boot on safe mode.

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

[saabuldin]

Yes this happens on any app i use. I will safe mode now.

[Phy]

If you experience lag while on safe mode, repair the phone with Sony PC Companion

http://www.sonymobile.com/gb/tools/pc-companion/

[saabuldin]

Ok I'm using the phone on safe mode now and it seems to be perfectly fine. So does this mean an app is causing the problem.

[Phy · Accepted solution]

Yes, that's a third party creating this lag, it could be an antivirus or another intrusive app.

[saabuldin]

I don't use antiviral. What's the easiest way to narrow which app is causing it. Sorry for typos. Not use to this Sony keyboard

[Phy]

You could repair the phone with Sony PC Companion, or you could uninstall app by app, until you find the app causing this issue.

[saabuldin]

Ok. Back to normal mode and still working fine for now. I will try and locate the culprit.

Anyway thanks for your help. Really appreciate the fast response.

Will update when i find the culprit.