You may possibly have a transceivver issue. Try changing out the transciever. Can you supply a show interface ethernet 0 command to show us. Possibly you may have excessive errors which are causing your up/down status...
There might be some platform dependency, but I have seen this error message sometimes when there was not anything plugged into the interface. It might also be an issue that whatever is connected has a shut down interrface. Can you check the physical connection for this interface and verify whether something is plugged in (and if there is a cable in the interface can you verify that something is on the other end of the cable and that it has an active interface)?
HTH
Rick
HTH
Rick
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