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?

[Phy]

Ok. Not a problem.

[saabuldin]

Since i booted into safe mode and back to normal mode. Its been fine. Lag has gone. I havent uninstalled any apps yet. I will see how it goes.

[Phy]

Ok. Let us know how it goes.

[ibsudanski]

Hello, I'm having the same problem. It's laggy, and booting takes a while, when my phone has booted it gives a black screen for 2 mins. or something like that, when I boot to safe mode I still have the problems, it's a little less than when not booting to safe mode but it's still slow and laggy even though I just did a clean install using Flashtool and XperiFirm.

EDIT: I did a clean install using XperiFirm and Flashtool a couple of weeks ago, everything was fine, until last night. From one moment to another my phone was laggy, slow, and the apps crashed and took hours to open, if they did. Tried the same fresh install this morning, it's a little less laggy, but it's still laggy with the factory set apps. Before I did the fresh install I had my phone charged to 100% of battery, 6 hours later, the battery was at 37% even though I haven't used it at all.

EDIT 2: According to Zimperiums Stagefright detector tool I have the stagefright virus/bug thing.....