dhcpd running amok

[computeralex92]

Hello,

since a while sometimes my Opnsense firewall gets unresponsive and the only way to "fix" this is to make a hard reboot via powercycle.
The last time this happens I was by luck present (normally this happen e.g. over night etc).
I checked everything and the firewall had 100% CPU usage and used over 6,5 GB memory.
Reason for this where over 400(!) processes with this command:

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/usr/local/sbin/dhcpd -6 -user dhcpd -group dhcpd -chroot /var/dhcpd -cf /etc/dhcpdv6.conf -pf /var/run/dhcpdv6.pid igb0

igb0 is my LAN interface btw.

Config content is:

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option dhcp6.domain-search "localdomain";
option dhcp6.rapid-commit;

default-lease-time 7200;
max-lease-time 86400;
log-facility local7;
one-lease-per-client true;
deny duplicates;
ping-check true;
update-conflict-detection false;
authoritative;

subnet6 IPv6_SUBNET::/64 {
  range6 IPv6_SUBNET::1000 IPv6_SUBNET::2000;
  option dhcp6.name-servers IPv6_SUBNET:227c:14ff:fea0:644e;
  prefix6 2003:ef:bf20:c080:: 2003:ef:bf20:c0f0::/62;
}

ddns-update-style none;

Did someone also experience this issue?

Thanks,
Alex