That happened a few times when my players were being done. Scared the sh*t out of me. However, no harm done. Do as Paul said and check for bridges. Its funny, 1 of my players went from this error to 32mb in 30secs :-)
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Andy MK2a 60GB Amber 040103916 32mb/Light Kit MK2a 50GB Amber 030102560 32mb