Today, the same.
I was unable to join my friend on ps4.
So I moved to ps3. Everything seems fine, playing with another mate. 3 o 4 Matches, suddenly the party split. And then, I can't join again.
if i had +1 for everytime i had an issue joining my friends , this thread would be like 9834329832 by now.
and i had +2 for everytime i waited around 20 minute to find a game it would be like 2335412567.
I think this bug is back again. I can't find games nor join my friends' lobbies. It's been like that for a week right after I installed the recent PS4 patch - which is 4.50. Please help.