Firewall all kinds of weird and spontaneous blocks on LAN
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IPv6 blocks on LAN (I edit part of the IPv6 address out since I suspect it to my my network MAC or something? (since googling within "" didn't return any hits).
These started a couple of days ago (I have no clue what triggered that) and are literally flooding my logs).

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Rule for VLAN40 is doing its thing on VLAN50 (?)

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Attached also the firewall rules for that VLAN50; I don't see any 'VLAN40' in here, so no clue why the previous weird picture.

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WAN2 (cable) blocked a private IP, but the destination is weird?

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Bootpc is bogon?

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NTP goes DNS.

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And the VLAN40 rules for the previous picture.

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Interfaces/WAN (VDSL).

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Interfaces/WAN2 (cable)

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Interfaces/LAN.

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Interfaces/VLAN40.

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Advanced/networking.

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System log settings.

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And, finally, the LAN rules in two parts (note the number of 'easy rules passed from firewall log view'. And even then they still aren't working, as the log is still flooded with IPv6 as shown in the first picture):

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LAN rules part 2:

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And finally, the multicast-alias in the LAN rules:

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So I will be feeling hugely indebted to everybody who can help me solve this, that goes without saying :P
(because it is driving me crazy, this flooding of logs which I am trying to fight with the firewall rules every day :-[).
Thank you in advance very much (really :-*),
Bye ;D
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EDIT: I forgot one screenshot from the general system log. Errors 'finding Ipv6 gateway' (?) on both WAN and WAN2 (=opt4).
I should also add that I added this WAN2 a couple of days ago (I don't know exactly when anymore), and I also don't know if that is when the IPv6-flooding in the logs and the error in the attached picture began :-\

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Cry. WIFE is angry with me now :-[
This is happening as I was busy with my failover WAN:

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And this, floods of it:

