Syncrepl Problem after repeatedly reboot

Hallo all,

we have 2 OpenLDAP 2.4.17 with  N-Way Replication on Debian Lenny.

Config
dn: olcDatabase={0}config
objectClass: olcDatabaseConfig
olcDatabase: {0}config
olcRootPW:: xxxxxxxxxxxxxxxxx
structuralObjectClass: olcDatabaseConfig
entryUUID: 446a8178-95f7-102e-8e9a-95c863b9a1ce
creatorsName: cn=config
createTimestamp: 20100115075644Z
olcSyncrepl: {0}rid=001 provider=ldaps://xxxxxxxxxxxxxxxx:636/ bindd
 n="cn=config" bindmethod=simple credentials=xxxxxxxxxxxxxxxxxxx
searchbase="cn=confi
 g" type=refreshAndPersist retry="5 5 300 +" schemachecking="on" timeout=3
olcSyncrepl: {1}rid=002 provider=xxxxxxxxxxxxxxxxxxxxxxxxxxx:636/ bindd
 n="cn=config" bindmethod=simple credentials=xxxxxxxxxxxxxxxx
searchbase="cn=confi
 g" type=refreshAndPersist retry="5 5 300 +" schemachecking="on" timeout=3
olcMirrorMode: TRUE
entryCSN: 20100115075655.626787Z#000000#000#000000
modifiersName: cn=config
modifyTimestamp: 20100115075655Z

We reboot one of the nodes a couple of times at the time as the other
node made ~ 60 000 adds.
After 12 hours there is still some difference between both nodes:

root@ldap1:~# ldapsearch -D "cn=manager,dc=xxx" -W -x -b "dc=xxx"
courseOfStudy=* | grep courseOfStudy | wc -l
Enter LDAP Password:
61125

root@ldap2:~# ldapsearch -D "cn=manager,dc=xxx" -W -x -b "dc=xxx"
courseOfStudy=* | grep courseOfStudy | wc -l
Enter LDAP Password:
47366

The contextCSN is equal on both nodes:

ldap1: 
ldapsearch -xLLLH ldaps://ldap1:636 -s base -b "dc=xxx" contextCSN -W -D "cn=manager,xxx"
Result:
contextCSN: 20100121183644.034011Z#000000#000#000000

ldap2: 
ldapsearch -xLLLH ldaps://ldap2:636 -s base -b "dc=uxxx" contextCSN -W -D "cn=manager,xxx"
Result:
contextCSN: 20100121183644.034011Z#000000#000#000000


Is there an easy way to force a new replication on the second node?
I will really appreciate your help...