Cannot Reliably Connect Devices Home Internet

The router will not be able to connect to an ipv4 data socket.  Windows thinks that it can use ipv4 or ip6 freely.  many older devices are ipv4 only.  If a router cannot open data sockets to sites requiring ipv4, then the application will hang.  So even if the PC basically seems to work most of the time, the first time it encounters a site that wants to communicate using ipv4 the router will NOT pass any data, thus it hangs.  So even if the PC basically works, it will open dead sockets from time to time.

Even if the streaming box/tv etc basically connects, the first time an app tries to open an ipv4 data stream it will hang, and your streaming will say no longer connected to the internet.

You see this a lot, it happens momentarily sometimes and corrects itself or other times the app just hangs waiting for data that will never come/go.

The way devices and the internet works right now, in 2021, you need a router that can pass data via ipv4 and ipv6 connections for the apps to work reliably.  I've noticed with a cellphone, or with an ipad websites and apps seems smart enough that they ONLY use ipv6.  Or at least almost NEVER require ipv4.  But with streaming devices, and with PCs this is NOT the case.