lumpi What is your test case exactly? If you boot up Kodi normally and then select through power menu suspend or shut down, you should be able to revive box either with power button press on the box or on the remote.
Ok good
As my daughter is occupying the TV I tried to send the box to sleep by the button...
Will try properly once she's in bed.
What scancode is it expecting from the IR? The original remote's or MCE?