Re: Screen lock not reliable after Froyo update
Not sure if you have seen this or not but with the update they added the option on when the pattern, pin, or password lock would activate.....I think that by default it was set at "After 3 min" or "After 5 min", but I would check that setting and set it to "Immediately" since it sounds like thats what you want.
Edit: It's under Settings -> Security-> Lock after
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