用了一年多的系统，昨天开始返回主窗口时，要等好一会，然后会出现错误提示

加载表"上报客户端_Table1"失败，详细错误信息:

System.Data.OleDb.OleDbException: 登录超时已过期

   在 System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection)

   在 System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject)

   在 System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup)

   在 System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)

   在 System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)

   在 System.Data.OleDb.OleDbConnection.Open()

   在 System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState)

   在 System.Data.Common.DbDataAdapter.FillSchemaInternal(DataSet dataset, DataTable datatable, SchemaType schemaType, IDbCommand command, String srcTable, CommandBehavior behavior)

   在 System.Data.Common.DbDataAdapter.FillSchema(DataTable dataTable, SchemaType schemaType, IDbCommand command, CommandBehavior behavior)

   在 System.Data.Common.DbDataAdapter.FillSchema(DataTable dataTable, SchemaType schemaType)

   在 Foxtable.oo　0　　O　.o　OO　o　　(OleDbConnection A_0, String A_1, String A_2, DataSet A_3, DataTableCollection A_4, String A_5, Boolean A_6, OleDbConnection A_7, UserInfo A_8, DataSet A_9, Int32 A_10, ProjectProperty A_11)