Ipv6 connectivity says no internet access?

My pc is connected to internet using cable. Lately, it became very slow. As compare to my wireless connection to my iphone. When i'm checking, ipv6 connectivity at my modem status says that no internet access. Is this the reason? How can i fix it?

Nothing you can fix if it is indeed an IPv6 problem. Call your provider.

IPv6 doesn't work for 90% of the world yet. This has nothing to do with your problem.

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