Has anyone else had issues with MQDs lately? I have noticed on recent flights that the MQDs credited are less than the base fare paid (not including taxes), usually by $100-120 in range. I challenged a recent error and got a standard reply that did not address the issue. I filed another request and it's gone to the auditors for review. If this is an isolated incident, no big deal, but if it's widespread across the DL community, this could mean millions of miles not properly credited. Thoughts?