I have two DNS-323, one I bought like last week, and the other is 1.5 years old. Both are running 1.08, but only one of them (the newer) has a setting for Power Recovery in the power management tab. Does this mean they are different hardware revisions, and could this difference be the reason why only one of them (again, the newer) is showing the popular fan-never-goes-off-although-set-to-auto/off/low/high bug?