Sql server 2008 R2 Automatically stopped

Question

My SQL Server 2008 R2 instance 

06/24/2011 13:48:24,Server,Unknown,The SQL Server Network Interface library successfully deregistered the Service Principal Name (SPN) [ XXXXXXXXXXXXXXX ] for the SQL Server service.

06/24/2011 13:48:24,Server,Unknown,The SQL Server Network Interface library successfully deregistered the Service Principal Name (SPN) [ XXXXXXXXXXXXXXX ] for the SQL Server service.

06/24/2011 13:48:23,spid6s,Unknown,SQL Trace was stopped due to server shutdown. Trace ID = '1'. This is an informational message only; no user action is required.

06/24/2011 13:48:23,spid6s,Unknown,SQL Server is terminating in response to a 'stop' request from Service Control Manager. This is an informational message only. No user action is required.

06/24/2011 13:48:18,spid13s,Unknown,Service Broker manager has shut down.

06/24/2011 13:48:12,spid113,Unknown,FILESTREAM: effective level = 0<c/> configured level = 0<c/> file system access share name = 'MSSQL2008R2'.

06/24/2011 13:48:12,spid113,Unknown,Configuration option 'show advanced options' changed from 1 to 0. Run the RECONFIGURE statement to install.

06/24/2011 13:48:12,spid113,Unknown,FILESTREAM: effective level = 0<c/> configured level = 0<c/> file system access share name = 'MSSQL2008R2'.

06/24/2011 13:48:12,spid113,Unknown,Configuration option 'Agent XPs' changed from 1 to 0. Run the RECONFIGURE statement to install.

06/24/2011 13:48:12,spid113,Unknown,FILESTREAM: effective level = 0<c/> configured level = 0<c/> file system access share name = 'MSSQL2008R2'.

06/24/2011 13:48:12,spid113,Unknown,Configuration option 'show advanced options' changed from 0 to 1. Run the RECONFIGURE statement to install.

Please help me to find a reason