**error occurred in Service Broker internal activation while trying to scan the user queue

Hi, I am getting bellow error while sending email from sql server. we are using amazon as SMTP mail server.

**error occurred in Service Broker internal activation while trying to scan the user queue 'msdb.dbo.ExternalMailQueue' for
its status. Error: 1222, State: 56. Lock request time out period exceeded. This is an informational message only. No user action is required.**

I also try to use below setting to fix it, but we are stilling getting the same issue.

ALTER DATABASE [msdb] SET SINGLE_USER WITH ROLLBACK IMMEDIATE
ALTER DATABASE [msdb] SET DISABLE_BROKER
SELECT is_broker_enabled FROM sys.databases WHERE name = 'msdb' ;
ALTER DATABASE [msdb] SET ENABLE_BROKER
SELECT is_broker_enabled FROM sys.databases WHERE name = 'msdb' ;
ALTER DATABASE [msdb] SET MULTI_USER
EXEC msdb.dbo.sysmail_stop_sp;
EXEC msdb.dbo.sysmail_help_status_sp;
EXEC msdb.dbo.sysmail_start_sp;
EXEC msdb.dbo.sysmail_help_status_sp;
EXEC msdb.dbo.sysmail_help_queue_sp @queue_type = 'mail';