Also please try our new "secure enclave" thing - in settings, should work much more reliably.

I've same issue, but I think the problem is we're in Asia, the nsec.app relay and nostr.band relay are really slow and unstable in our location.

nsec.app is running over relay.nsec.app which is a normal strfry. It's actually quote slow for ephemeral events processing - it has internal latency of at least 300ms for delivery of new events to active SUBs, plan to switching to something more specialized. Aside from that, again, try the secure enclave thing in settings.