FillDB Error "Unable to Connect to Database"

We are running Bigfix 9.5.13. Every morning we are finding we need to restart the Bigfix services on the root server because fillDB has lost a connection to the database and apparently cannot reestablish it. These are the errors in the fillDB log that keep repeating until services are stopped.

Tue, 11 Aug 2020 03:06:12 -0700 – 5776 – Encountered error during computer sequences update: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:12 -0700 – 5776 – Error storing reports: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:12 -0700 – 5776 – Encountered error during computer sequences update: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:12 -0700 – 5776 – Error storing reports: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:12 -0700 – 5776 – Encountered error during computer sequences update: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:12 -0700 – 5776 – Error storing reports: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:25 -0700 – 2008 – Encountered error during computer sequences update: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:25 -0700 – 2008 – Error storing reports: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:25 -0700 – 5776 – Encountered error during computer sequences update: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:25 -0700 – 5776 – Error storing reports: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:28 -0700 – 2008 – Encountered error during computer sequences update: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:28 -0700 – 5776 – Encountered error during computer sequences update: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:28 -0700 – 5776 – Error storing reports: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)
Tue, 11 Aug 2020 03:06:28 -0700 – 2008 – Error storing reports: Database Error: [Microsoft][SQL Server Native Client 11.0]Communication link failure (08S01: 0)

Curiously is the error the same approximate time every night?

Any maintenance going on on the SQL DB?

We had this exact error sequence appear this last Thursday, 2021-04-15. We’re also on 9.5.13.

We’re trying to chase down a cause.