some further attempts to troubleshoot, going through logs and fixing any errors
I saw the same error as in this post, and have disabled ra and dchpv6 in the LAN dhcp configuration.
There is also an error "iee80211 phy1: staid 1 deleted". I found this site which suggest to:
Do not use Autochannel
Do use WPA2 Personal with CCMP-128 (AES), you forgot to enable this last one
Im not sure where the autochannel setting is?
as for my security Im using
5ghz - WPA PSK (CCMP)
2.5 - WPA/WPA2 PSK (CCMP)