Status is showing as 'Okay' and timestamp for last communication update looks current, so I can't see evidence of a communication error from your example.
Calvin, thanks for your input. Although my first thoughts were this is a network issue I believe from a core router change I did find a work around/fix, advice from Hitachi support states that I should edit the HitDFmon.config file with Admin privileges. Gonna give it a go and see what's up. Thanks again