SharePoint Web Servies Round Robin Service Load Balancer Event: EndpointFailure

I'm getting intermittent search errors on the WFE server as follows:

SharePoint Web Services Round Robin Service Load Balancer Event: EndpointFailure

Process Name: w3wp

Process ID: 420

AppDomain Name: /LM/W3SVC/122649174/ROOT-1-130237821687796815

AppDomain ID: 2

Service Application Uri: urn:schemas-microsoft-com:sharepoint:service:75f59780673348c2adece087c4d884b2#authority=urn:uuid:59e728aa132e4341b7385ee7b29911d3&authority=https://lhmdcwa503:32844/Topology/topology.svc

Active Endpoints: 1

Failed Endpoints:1

Affected Endpoint:  ????:??????/75f59780673348c2adece087c4d884b2/SearchService.svc

This server wfe4 is front end server without any Search Services configured. The actual search service is running on wapp5 server. How would I fix this so the error disappers?

Thanks,

Patrick