Weird "PoweredUnit" bug & one thing...

[Bobingabout]

2) unit does not seems to give a **** about the building which powers it! Even the building is for example sold, the unit still fuctions.

did you by any chance own an allied robot control when this happened?

its a known bug, and you can only have 1 powered unit in the game. if you do have more than 1, either using a second building, or adding more than 1 unit to the PoweredUnit= tag, then the second unit does things like this:
the unit doesn't instantly power down when the power goes down, it only powers down if it is doing a command, or you give it a command, such as Move, or Attack.
the unit, once powered down, will never wake up, even if the power returns.

I'm not 100% sure, but this bug does apear to be per player, meaning if all players have 1 robot type each, and power goes down, they still act normal.