Wallpaper and Screen Light problem

[zavlak]

After the latest Update, My Screen Light keeps turning on without no reason. Also My wallpaper changes itself with a colorfull picture (everytime different Pictures) that doesn't exist in My phone or sometimes only Black Screen sets as wallpaper. Doesn't anyone have this problem?

[Samuel1]

Seems very weird actually. And this happened directly after you updated the phone?

Do you use any apps that control the background or screen lock? If that's the case, it might be that acting up. If not, you should try to reset the phone or repair the software.

http://www.sonymobile.com/update

[zavlak]

I have used an app that controls the background but i removed it long time ago. Because i didn't like it. Weird colorfull pictures which set as background itself ( it happened again this morning ), seems like the apps pictures that i have removed. Though i removed the app, i think it still controls my phone. The best way to do is a reset like you say. Thank you Samuel, i will inform if i can fix.