お世話になっております。

下記の状況と同じ状態になってしまいました。
http://xoops.ec-cube.net/modules/newbb/viewtopic.php?topic_id=8465&forum=11


EC CUBEのログは下記のようになっています。

1.登録ボタンを押してからポップアップメッセージが出るまで早い時

access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP

2.遅い時

access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP
SQL_LOG [3.33sec]
PREPARE mdb2_statement_mysql_6e1433128f56d533c03310dd5ab817d14e2923796 FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'2011/08/22 11:35:17 [/shop/admin/design/template.php] access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP
SQL_LOG [2.55sec]
PREPARE mdb2_statement_mysql_32d44b206bff4d0bfad51d2ac10ef10865fc9c11e FROM 'DELETE FROM dtb_blocposition WHERE page_id <> 0 AND device_type_id = 10'SQL_LOG [2.55sec]
PREPARE mdb2_statement_mysql_4999955b2c29ac749647a593a3dfebe99af636770 FROM ' INSERT INTO dtb_blocposition (device_type_id, page_id, target_id, bloc_id, bloc_row, anywhere) VALUES (10, 1, 1, 1, 2, 0)'SQL_LOG [2.53sec]
PREPARE mdb2_statement_mysql_59b02a97814681ee18f453278cce4bd1c0f304f20 FROM ' INSERT INTO dtb_blocposition (device_type_id, page_id, target_id, bloc_id, bloc_row, anywhere) VALUES (10, 1, 1, 2, 3, 0)'2011/08/22 11:38:59 [/shop/admin/home.php] access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP


3.エラーらしきものが出ているログ

access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP
SQL_LOG [2.26sec]
PREPARE mdb2_statement_mysql_534f66ec2a6e90e5f833dfc8fdfcfacb58ad2d54f FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'2011/08/22 11:15:59 [/shop/admin/design/css.php] access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP
SQL_LOG [6.23sec]
PREPARE mdb2_statement_mysql_533c2c99061a7e688d5a30f129c980d372775a26e FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'2011/08/22 11:16:20 [/shop/admin/design/header.php] access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP
SQL_LOG [4.98sec]
PREPARE mdb2_statement_mysql_54e52d2de7f9215d8044a44949c95fa0c80101f65 FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'2011/08/22 11:17:21 [/shop/admin/design/template.php] access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP
SQL_LOG [13.02sec]
PREPARE mdb2_statement_mysql_61067fe4bd7caedbb4be02918a6e85b89dfbaca19 FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'2011/08/22 11:17:44 [/shop/admin/design/template.php] access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP
SQL_LOG [8.59sec]
PREPARE mdb2_statement_mysql_3cc3ca8805495f457749aae7f2a68e1476c053105 FROM 'DELETE FROM dtb_blocposition WHERE page_id <> 0 AND device_type_id = 10'2011/08/22 11:17:56 [/shop/admin/design/template.php] access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP
SQL_LOG [5.89sec]
PREPARE mdb2_statement_mysql_440247c5558fc5898ea3f2b13949c38d8e187a6bc FROM ' INSERT INTO dtb_blocposition (device_type_id, page_id, target_id, bloc_id, bloc_row, anywhere) VALUES (10, 1, 1, 1, 2, 0)'SQL_LOG [8.46sec]
PREPARE mdb2_statement_mysql_335656052b6bb49a3146b597b5b6a3ba99526dcb0 FROM 'DELETE FROM dtb_blocposition WHERE page_id <> 0 AND device_type_id = 10'SQL_LOG [6.19sec]
PREPARE mdb2_statement_mysql_51f480d470cca2573c3658504d374b6050d79e0a1 FROM ' INSERT INTO dtb_blocposition (device_type_id, page_id, target_id, bloc_id, bloc_row, anywhere) VALUES (10, 1, 1, 2, 3, 0)'FATAL Error(256) /PATH_TO/httpdocs/data/class/SC_Query.php:903 https:// DOMAIN_NAME /shop/admin/design/template.php?

SERVER_ADDR: IP
REMOTE_ADDR: IP
USER_AGENT: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; YTB730; GTB7.1; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; Sleipnir/2.9.7)

SQL: PREPARE mdb2_statement_mysql_5269c16d047fa129f2519ff4ccfab07bea210084c FROM ' INSERT INTO dtb_blocposition (device_type_id, page_id, target_id, bloc_id, bloc_row, anywhere) VALUES (10, 1, 1, 2, 3, 0)'

MDB2 Error: constraint violation

_doQuery: [Error message: Could not execute statement]
[Last executed query: EXECUTE mdb2_statement_mysql_5269c16d047fa129f2519ff4ccfab07bea210084c]
[Native code: 1062]
[Native message: Duplicate entry '10-1-1-2' for key 1]


/PATH_TO/httpdocs/shop/admin/design/template.php 34:LC_Page_Admin_Design_Template_Ex->process
/PATH_TO/httpdocs/data/class_extends/page_extends/admin/design/LC_Page_Admin_Design_Template_Ex.php 56:LC_Page_Admin_Design_Template->process
/PATH_TO/httpdocs/data/class/pages/admin/design/LC_Page_Admin_Design_Template.php 66:LC_Page_Admin_Design_Template->action
/PATH_TO/httpdocs/data/class/pages/admin/design/LC_Page_Admin_Design_Template.php 91:LC_Page_Admin_Design_Template->doRegister
/PATH_TO/httpdocs/data/class/pages/admin/design/LC_Page_Admin_Design_Template.php 279:LC_Page_Admin_Design_Template->updateBloc
/PATH_TO/httpdocs/data/class/pages/admin/design/LC_Page_Admin_Design_Template.php 207:SC_Query->query
/PATH_TO/httpdocs/data/class/SC_Query.php 735:SC_Query->execute
/PATH_TO/httpdocs/data/class/SC_Query.php 888:MDB2_Statement_Common->execute
/PATH_TO/httpdocs/data/module/MDB2.php 4152:MDB2_Statement_mysql->_execute
/PATH_TO/httpdocs/data/module/MDB2/Driver/mysql.php 1654:MDB2_Driver_mysql->_doQuery
/PATH_TO/httpdocs/data/module/MDB2/Driver/mysql.php 798:MDB2_Driver_Common->raiseError
/PATH_TO/httpdocs/data/module/MDB2.php 1497:PEAR->raiseError
/PATH_TO/httpdocs/data/module/PEAR.php 557:MDB2_Error->MDB2_Error
/PATH_TO/httpdocs/data/module/MDB2.php 1009:PEAR_Error->PEAR_Error
SQL_LOG [8.79sec]
PREPARE mdb2_statement_mysql_5f90f726ac42cafafad8a2db71859c8b67804e111 FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'SQL_LOG [2.04sec]
PREPARE mdb2_statement_mysql_32094540d136b6e3447ce61a9d34727081e6e2669c FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'SQL_LOG [3.55sec]
PREPARE mdb2_statement_mysql_7c515e3578b641ec4bc4dedd993c22eb1374f5742 FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'SQL_LOG [3.96sec]
PREPARE mdb2_statement_mysql_730aa8047d2e7ad8b20bf9e77fb8752ae5c5d7b5c FROM 'UPDATE dtb_session SET sess_data= ?, update_date= Now() WHERE sess_id = ?'2011/08/22 11:18:25 [/shop/admin/index.php] access : user=master auth=0 sid=4hcasotii29qr2knh5eu112ov4 from IP


このようになっていますが原因分かりますでしょうか？

-----------------------------------------
サーバー環境
EC-CUBEバージョン 2.11.2
PHPバージョン PHP 5.2.10
DBバージョン MySQL 5.0.77
-----------------------------------------