This has started happening in the past 2 months… before everything was fine
Discussion
Here's an easy test. Try each of these addresses in your browser:
172.217.20.174
2a00:1450:4007:80c::200e
They should both go to google.com
If they both work, it's something else. If only the first works, your ip6 setup is broken some how. It could also be something your ISP is doing.
I’ll test this tonight. Thank you!