dhcpd6 crashing almost every day

[Jeremy Ainsworth]

My dhcpd6 is crashing almost every day for at least a year now. I've had to
write a systemd override just to handle the restart.

syslog for each time it falls over:

Feb 27 11:31:46 miranda dhcpd[19771]: Client
00:01:00:01:21:b0:9a:89:b0:6e:bf:84:66:19 releases address
_______(IPv6)_________
Feb 27 11:31:46 miranda sh[19771]: ../../../lib/isc/heap.c:219: REQUIRE(idx
>= 1 && idx <= heap->last) failed, back trace
Feb 27 11:31:46 miranda sh[19771]: #0 0x7f6a4d458e07 in ??
Feb 27 11:31:46 miranda sh[19771]: #1 0x7f6a4d458d5a in ??
Feb 27 11:31:46 miranda sh[19771]: #2 0x7f6a4d45fe5a in ??
Feb 27 11:31:46 miranda sh[19771]: #3 0x558f45d6099e in ??
Feb 27 11:31:46 miranda sh[19771]: #4 0x558f45d5942f in ??
Feb 27 11:31:46 miranda sh[19771]: #5 0x558f45d57303 in ??
Feb 27 11:31:46 miranda sh[19771]: #6 0x558f45d5fa6b in ??
Feb 27 11:31:46 miranda sh[19771]: #7 0x558f45d600e2 in ??
Feb 27 11:31:46 miranda sh[19771]: #8 0x558f45d7b8f0 in ??
Feb 27 11:31:46 miranda sh[19771]: #9 0x558f45d6aa33 in ??
Feb 27 11:31:46 miranda sh[19771]: #10 0x558f45d9ab8e in ??
Feb 27 11:31:46 miranda sh[19771]: #11 0x7f6a4d49008b in ??
Feb 27 11:31:46 miranda sh[19771]: #12 0x7f6a4d47f7ee in ??
Feb 27 11:31:46 miranda sh[19771]: #13 0x7f6a4d484630 in ??
Feb 27 11:31:46 miranda sh[19771]: #14 0x7f6a4d484af5 in ??
Feb 27 11:31:46 miranda sh[19771]: #15 0x558f45d6cbf0 in ??
Feb 27 11:31:46 miranda sh[19771]: #16 0x558f45d20888 in ??
Feb 27 11:31:46 miranda sh[19771]: #17 0x7f6a4d28209b in ??
Feb 27 11:31:46 miranda sh[19771]: #18 0x558f45d2117a in ??
Feb 27 11:31:46 miranda systemd[1]: isc-dhcp-server6.service: Main process
exited, code=dumped, status=6/ABRT
Feb 27 11:31:46 miranda systemd[1]: isc-dhcp-server6.service: Failed with
result 'core-dump'.

Will or how or when or can this be fixed? I can help, provide anything that
might help to diagnose. Thanks. I'm getting a bit frustrated :/

Thank you
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