Galaxy S4 lock screen gets disabled

[AC Question]

Hi,
occasionally my Galaxy S4 disables the lock screen.

I have set the lock screen to use a pattern for security but a simple swipe will unlock it. There is also a lock icon at the bottom of the screen which brings up the lock screen.

Why is this happening? Why doesn't the lock screen engage automatically?

 

[Javier P]

Hi, welcome to the forums! Do you have the Webroot app installed in your phone? There are some reports of this app disabling the lock screen method.