I'm aware this thread is more about G&G, but Gnome Bomb has been down for several days too. I unfortunately purchased another PS4 GW disk (used) recently as a last resort. I should have done my research before jumping to conclusions about the original disk. I'll chalk it up to live and learn. I enjoy GW and hope there is a solution. Thanks.
as for me, I tried to play the game with two different internet providers.
with first I can connect gardens and graveyards with no black screen, but it's always an empty server, any time of the day. only once I had a full server and it was like a miracle, but the time was 4 am so I went to sleep shortly after ☹️
and with the second provider I get the mentioned black screen of death again and again. I haven't tried other game modes though, but I want to play only g&g.
