Mine's the same way. It was fine when I bought it but a couple months later (winter set in) it wouldn't work. I took the cylinder out and cleaned and lubed it well (it was soooo nasty and caked with dirt and debris) but one of the tumblers is still sticky and won't fall back into place after the largest bump on the key passes it. Oh, well, I got my keyless entry working and my cable release works so I don't worry about it too much.
Scott