Not sure what you mean by 'fully enabled', IPv6 cannot be partially enabled. Which type of router do you use? Could you post the IPv6 WAN + LAN configuration?
Current downstream and upstream values (power + MER) are good. However, the OFDM channel does exhibit a large amount of correctable errors, uncorrectable errors should normally remain 0. OFDMA channel dropouts (US profile assignment change w/o new profile, T4 timeout, TCS partial service) are visible in the event log on March 1.
Could you post one or more pictures of the AOP (main outlet in meter cupboard or living room) and cables, plus splitter(s) and signal amplifier, as applicable?