Hi guys, my 580EX II makes a very faint, almost imperceptible double clicking sound every one second or so and it only does it with fully charged batteries. If I put in batteries that are at lets say 30%, it isn't there. Everything works fine but it kind of bugs knowing that it is there. Makes me think that something isn't working right and will make the flash fail over a short period of time. Any of you guys have that same click by chance?

