snmp and freeradius restart

hi - we're successfully using snmp to monitor the freeradius statistics. however - when freeradius is restarted with HUP signal, the snmp connection doesn't work. i'm not too familair with snmp/smuc but i'm guessing freeradius is not reconnecting to snmpd? to solve this we have to restart snmpd before freeradius. is this a known issue? t