Does not work correct with 7.x Rated 2 out of 5 stars

Nice idea, but it does not work correct with version 7.x
Sometimes you need to type the pw again after setted time although you are working and sometimes it is not neccessary althoug the pc was not used.
e.g. I set it to 60 seconds. This morning I do not need to retype the password althoug the laptop was not used over night.