In my testing, I don’t have the same problem with all Nostr clients. It’s something unique to the combination of Primal without its privacy proxy enabled and VPN clients. I’ve tried multiple privacy VPNs and multiple Nostr clients. Primal’s web and mobile apps are both affected. And iOS and multiple Chromium-based desktop browsers are affected. (Not tested other browsers yet.) No clear causal mechanism - traffic just stops after a while.