So it was EEE, after all?
Good 
(which means bad 
)
There is a lot of confusion about it, it is documented to have been forcibly disabled on all devices since 7.22.1 but it seems like not all devices actually comply, the RB5009 should (but the 4011 is reported as having it somehow enabled, depending on which lan card/chip is on the "other" side, see around here):
V7.22.1 [stable] is released! - #24 by whatever
The RB5009 should have it disabled (since 7.22.1) so, next time you update the RouterOS to 7.22.1 or later you should check again.
P.S. Oops sorry guys, you posted while I was writing my post