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This Comm Fail status is related to a quality flag given by an OPC server when the quality of the data is bad. This is explained in the following KB article: KB01298
When the OPC server sends a data with bad quality ‘000110LL’, it will reflect “Comm Fail” in the PI server. Whenever this happens, we should check the OPC server, verify its state and see if the tag is updating correctly. If this is the case, we don’t really have a way to prevent this from happening since the bad quality data is sent by the OPC server.
I hope this information is useful!
Thanks for your reply. We will start searching the root cause in the OPC server than.