I found CSCee96038 has similar symptom of what you described. You have to verify linecards matched to your module or not,
You reload the switch recently? If the CRC error incremented right at boot up then he most likely hit CSCee96038. Upgrade to 12.2(25)EW and higher or 12.2(18)EW3 should help.
If you got any below error message.
%PQUICC-1-LOSTCARR: Unit [dec], lost carrier. Transceiver problem
The Ethernet 10BASE-T cable is unplugged.
Recommended Action: Reconnect the 10BASE-T Ethernet cable.