Has anybody ever found a solution for this? I am having the same issue.
Hee is a Cisco Forum post rerrering to an sc0 transitioning to higher than normal discards. Is this what you are seeing?
https://supportforums.cisco.com/thread/208088;jsessionid=FC1A297C2B092721B459B2ED3F973162.node0?decorator=print&displayFullThread=true
Isaac - those links are all dead