Failed to start task to process a down notification for the local Windows Server Failover Clustering (WSFC) node (SQL OS ...

Failed to start task to process a down notification for the local Windows Server Failover Clustering (WSFC) node (SQL OS error: %1!s!). Possible causes are no worker threads are available or there is insufficient memory. Check the state of the local WSFC node. If this problem persists, you might need to restart the instance of SQL Server.