When in manual focus (what Olympus call the 'Snapshot mode') I've noticed a bit of backlash in the focus ring. For example, if I move the ring to the right and then move it to the left, it will move a few degrees to the left without moving the barrel. Same the other way, i.e. left then right. I can move it something like 3 or 4 degrees either way before it starts to take effect. Anyone else experience this?