Ldap Authentication question

Hi, I've a freeradius-server-2.1.9-1.7.x86_64 running in opensuse 11.3. My authentication frontend is an openldap2-2.4.21-9.1.x86_64. I have correct mac address authentication, but *ONLY* the first try, the later always fail. I'm using 3 devices, the first one that connects logs in fine, but the others fail. Has any one a clue of what I did wrong? I've multiple rules in users file, all of them with Auth-Type = <ldap instace name>, one "rule/ldap instance" per vlan. With radius -X I see a correct first authentication, but the others fail. Kind regards.