Pretty much brand new Linkstation Pro LS-V3.0TL, installed and seems to be working fine, copied some data over, no complaints, and the unit is relatively silent once booted, but I am noticing an occaisonal clicking noise, just every so often. Comes in a sequence of 2-3 really quickly, then no noise at all. It can quite some time between these noises, so I was kind of guessing it might be the heads unloading or some sort of spin down to save power, but I figured I'd ask if it's normal. Seems to happen sometimes when the unit is not in use, and just every so often, haven't had it running long enough to know much more than that. Is this normal behavior?