We had a long conversation about it.
Here, let's discuss the pros and cons of dual stack IPv4 and IPv6 home network. I personally have IPv6 disabled on my firewall for easier control and security reasons. My ISP provides 2x external IPv4 addresses as well as 4x IPv6 addresses. I would like to hear the benefits of running dual...
www.snbforums.com
Don't be surprised if your traffic goes around your VPN client using IPv6, for example. Read what parts of the firmware and scripts are IPv4 only. You have opened another door in/out of your network and you don't know why. You're not getting any better experience. In some cases just the opposite.
If you have issues, you'll find from 3rd party. You have no way to diagnose your IPv6 connection. Like 60+ million users never found their physical address can be revealed by ISP routers with IPv6 enabled. The issue is fixed now, but it was real. Good luck with your home router and hope for the best.