Some time ago, I noticed that two people in nostr (+me) have strange problem: sometimes some people were missed from feed. All three of us had different client; I checked relays and noticed that all of us had one common relay; as you probpably already guessed, it was relay.damus.io I tried to cut out it, but due to NIP-65, it wasn't possible; so I just wrote "127.0.0.1 relay.damus.io" in hosts file; this wasn't helpful to me.... So, some other relay(s) are unstable & freeze feed updates as well....