Lock screen

[Uti]

I set my Extreme to lock when it goes to sleep after two minutes and require a PIN to unlock. I have found out that it doesn't always lock, sometimes overnight it will stay unlocked. Anyone else had this problem and know a fix for it?

Apologies if that's be discussed somewhere else, I haven't seen it so point me in the right direction.

[Piers]

Do the other lock screens, such as drag to unlock, do the same?

[Uti]

I'm at work and my Extreme's at home, but from what I remember the drag to unlock was always fine, or maybe I just did not notice because I didn't care then.