tables get lock during backup in db2 v9.5

hello every body
i have a problem in db2 v9.5.i hope you can help

In IBM DB2 v9.5,when I back up my database and restore it on a new database, some of my tables in restored database are locked.
My back up command is :
CONNECT TO MYDB;
QUIESCE DATABASE IMMEDIATE FORCE CONNECTIONS;
CONNECT RESET;
; BACKUP DATABASE MYDB TO "C:\" WITH 2 BUFFERS BUFFER 1024 PARALLELISM 1 WITHOUT PROMPTING
CONNECT TO MYDB;
UNQUIESCE DATABASE;
; CONNECT RESET;
This problem occurs every time I backup and restore my DB.
thank you in advance