Sharepoint 2016 not able to connect to database intermittently

I have a Sharepoint 2016 Farm configured with Shared Roles. Below is the Configuration details.

  • 2 X Web Front End Servers with Distributed Cache
  • 2 X Application Servers with Search
  • 1 X Domain Controller
  • 2 X SQL Servers in Failver Cluster (configured with High
    Availability)

Although I am facing an issue wherein One of the Web Front End Server (WFE1) is sometimes not able to connect to database. I see the logs and find the below Error message.

Unknown SQL Exception 53 occurred. Additional error information from SQL Server is included below.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server)

This issue happens twice in a day. How do I figure out what is happening wrong. Any support will be highly appreciated.