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"Settings" > "Security" > "Lock phone after" > and select, "Immediately".

The above has been my security lock setting for the past year. It was working fine but as of a week ago it hasn't been working. How can I fix it?

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What specifically isn't working about it? And what version of Android are you on? Have you updated it recently? –  Peanut Dec 3 '12 at 11:58
Does it take a while to lock? Has the setting changed? Are you rooted? Could an app be doing it? –  Liam W Dec 3 '12 at 16:12

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