You see Nostr messages and follows only if you happen to connect to the same relay servers as other users. So it connects to many relays redundantly in an attempt to find them all. In my case half of my followers and replies on my threads appear and disappear due to some popular public relays being overloaded.

@note1th3qafw4tl7xxzsk6vfapf0xr6z9a7h4vn7kx36zaps92svz75csgsxm55