How should I report the following issue..

So somewhere late last year I notice certain sites started giving http2 errors. I thought it was some temporary routing disruption and just used vpn to continue browsing...

Then came April and the issue is still going on so I decided to dig further...
I did the usual diagnostics (test on other devices, upgrade router firmware, changed router, etc..) and found out that it's only happening for some IPs, more specific certain gateways.

Since then whenever I reboot my router I have kept a spreadsheet log of my changed IPs, gateway address and the http2 working status.



The main site I'm using to test the http2 error status is https://www.xda-developers.com

When it not working, using any browser on any devices will always show http2 loading page error.