I have Google Nest Wifi connected to my router.
Everything was working great, until couple of weeks ago, YouTube stopped working when i use the Google WiFi - it's getting stuck on buffering.
In contrast, using my router WiFi (not Google's) works seamlessly.
Any idea why?
"Using my router WiFi (not Google's)" indicates double NAT, which is not ideal. Nest Wifi itself is a router with NAT, firewall, DHCP. Any routers in front of it should be bridged.
But to your specific problem, try to disable IPv6 and see if that makes a difference:
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I have the same problem but the issue is with specific streaming. For example it take lots of time for youtube to play a video. It takes discord lots of time to connect to a voice channel. When i am connected directly to the router (not using google wifi) it works perfectly. I think it started a week ago.