Phone won't sleep

[grunty]

Have just updated to lollipop on my Z2.

But now the phone's backlight stays on unless I press the power button.

Sleep mode is set to 30 seconds.

Have turned smart backlight control off to no avail.

Have had to turn off all notifications because of accidental key presses etc

Any solution to this?

[Phy]

It could be an app causing this issue, boot on safe mode, see if you experience the same problem.

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