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This is a problem with CO
WaW servers. It should be patched soon because this happend on COD4 also. If you notice that your online level has dropped the best thing to do is NOT PLAY. Quit game logout from PSN and sign back in.
This may not always work, but most of the time it does. Yesterday I noticed I dropped from level 15 to 10 and did this it was reset back to 15.