Getting Communication Link Failure

[abanis24]

('08S01', '[08S01] [Microsoft][ODBC Driver 18 for SQL Server]Communication link failure (0) (SQLExecDirectW)')

Getting this error while invoking my function app that connects to pyodbc. But after deploying my function app it doesn't throw any error. After sometime again I do get this error. Can anybody suggest me to mitigate this error?

Thanks in advance!