Xbox One and Windows Store on my PC will not install or load games with IPv6 enabled

ISP is Spectrum.

I setup IPv6 on this router almost a year ago. Everything was good immediatly there after. Then I started noticing occationaly trying to start a game on my Xbox would give me an error. I also noticed I had trouble installing new games or updates. These problems were far and few between 6 months ago. As time went on they became more and more persistent. A couple of weeks ago it got to the point where I could not even play, install, or update anything on my Xbox. After hours with support they determined my xbox needed repair. I bought a brand new xbox and guess what, it did the exact same thing. I then noticed anything tied to the Windows store on my PC had all the same issues. I tried making a new microsoft account and it had all the same issues. I then discovered if I disabled IPv6 in my router everything works fine.|

So here is where I am at, Is there a configuration that will allow me to use IPv6 and keep my Microsoft account happy? Do I need to use a custom firmware such as Tomato to achieve this? Or do I just need to get a different brand router?