Very strange. What I’d do for now is use another instance. If you want, you can export your subscriptions using the Migrator tool, and then import them into another instance (such as lemm.ee). Then, you can carry on as normal!
You’ll need to sign up for lemm.ee but otherwise nothing else will change.
Are you absolutely not using any kind of dns blocking, e.g pihole/nextdns/etc? It could be causing it.