'Report Abuse' nonstop, how to further handle?

In one of the subs I mod, the last several weeks we keep having every single post reported that was previously mod reviewed/approved. On every single one of these reports we've been reporting it back as 'report abuse' and occasionally adding additional comments, however this has continued. It's getting tiresome to have to keep going through noting 'report abuse' when nothing seems to be happening about it as a result.