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master/slave sync stops working

Hi List,

I have trouble with my fresh setup openLDAP Master/Slave sync.

The slave stops syncing every few hours with the message shown below. If I restart the slave things start working again. I monitored the network connectivity between th hosts and there is no issue with that.

Debug output running slapd -d 256 -d 128
5b23c9dc do_syncrep2: rid=001 (-1) Can't contact LDAP server
5b23c9dc do_syncrepl: rid=001 rc -1 retrying (4 retries left)

/var/log/syslog
Jun 15 16:14:52 ldap-server slapd[5178]: do_syncrep2: rid=001 (-1) Can't contact LDAP server
Jun 15 16:14:52 ldap-server slapd[5178]: do_syncrepl: rid=001 rc -1 retrying (4 retries left)

I'm running
Ubuntu 16.04.4
openLDAP 2.4.42 (from Ubuntu repository)
on both servers.

I setup the sync using these LDIFs on the master.

dn: olcDatabase={1}mdb,cn=config
changetype: modify
delete: olcAccess
olcAccess: {0}
-
add: olcAccess
olcAccess: {0}to attrs=userPassword,shadowLastChange
  by dn="cn=admin,dc=domain,dc=com" write
  by dn="cn=replicator,dc=domain,dc=com" write
  by self write
  by anonymous auth
  by * none
-
delete: olcAccess
olcAccess: {2}
-
add: olcAccess
olcAccess: {2}to *
  by dn="cn=admin,dc=domain,dc=com" manage
  by dn="cn=replicator,dc=domain,dc=com" manage
  by self write
  by anonymous auth
  by users read


dn: cn=module{0},cn=config
changetype: modify
add: olcModuleLoad
olcModuleLoad: syncprov.la


dn: olcDatabase={1}mdb,cn=config
changetype: modify
add: olcDbIndex
olcDbIndex: entryUUID,entryCSN eq


dn: olcOverlay=syncprov,olcDatabase={1}mdb,cn=config
changetype: add
objectClass: olcOverlayConfig
objectClass: olcSyncProvConfig
olcOverlay: syncprov


On the Slave I imported these LDIFs

dn: cn=module{0},cn=config
changetype: modify
add: olcModuleLoad
olcModuleLoad: syncprov.la


dn: olcDatabase={1}mdb,cn=config
changetype: modify
add: olcDbIndex
olcDbIndex: entryUUID,entryCSN eq


dn: olcDatabase={1}mdb,cn=config
changetype: modify
add: olcSyncRepl
olcSyncRepl: rid=001
  provider=ldap://ldap-master.domain.com/
  bindmethod=simple
  binddn="cn=replicator,dc=domain,dc=com"
  credentials=PASSWORD
  searchbase="dc=domain,dc=com"
  scope=sub
  schemachecking=on
  type=refreshAndPersist
  retry="30 5 300 3"
  interval=00:00:00:30
  starttls=yes
  tls_reqcert=allow

I'm really new to openLDAP so please let me know how to provide additional Info if you need them.

Thanks and best regards,
Kai