restart your nostr client
Discussion
Known 🐞 https://github.com/damus-io/damus/issues/1132
You can double check your relays on nostr.watch.
Its a #damus issue
I still haven’t seen this bug… resuming the app should ping and reconnect :/
Killed and restarted. 
I’m still getting this every so often when I open Damus. Takes 1-3 restarts to connect to relays, and occurs at least every couple of hours
