Apple wired keyboard cause unwanted wakeup from sleep

Hi,
when I want to sleep (either by keyboard or power button) Mac mini, the computer enters sleep.
Unfortunately, after a few seconds, the computer wakes up without interference.
I've tried all the recommended procedures to fix problems with sleeping/waking without success.
When I disconnect the keyboard and press power button, the computer falls to sleep and remains in sleep.
When I connect this keyboard to another Mac Mini, this is also self-awakening.
Please, can anybody help me with this strange problem?
Thanks
=== from kernel.log ==========================
May 25 21:13:13 mini kernel[0]: System Sleep
May 25 21:13:14 mini kernel[0]: Wake reason = EHC2
May 25 21:13:14 mini kernel[0]: System Wake
May 25 21:13:14 mini kernel[0]: Previous Sleep Cause: 5
May 25 21:13:14 mini kernel[0]: The USB device Keyboard Hub (Port 4 of Hub at 0x26000000) may have caused a wake by issuing a remote wakeup (2)
May 25 21:13:14 mini kernel[0]: The USB device Apple Keyboard (Port 2 of Hub at 0x26400000) may have caused a wake by issuing a remote wakeup (3)
========================================

As I noted above, computer goes to sleep by every way - power button, sleep timer, shortcut or menu.
But remains sleeping ONLY with keyboard unconnected.
Problematic keyboard worked well for many months until recently.
Same situation is on another Mac mini.
With another keyboard (from old PC) everything works fine (except hibernating shortcut, of course).

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