Remote Storage cannot issue further recall notifications due to an internal threshold being hit. Please restart the %1 service. ...

Remote Storage cannot issue further recall notifications due to an internal threshold being hit. Please restart the %1 service.
  If this error repeats itself, a malicious user may be trying to use all server resources.
  In order to identify the malicious user, open the Shared Folders console. The malicious user will maintain an open session and an open handle to a truncated file on the managed volume.