Does anyone know how to solve this problem?

I have been trying to login on my ps4 and after about 5-10 minutes it shows me this massage ( unexpected server error) or sometimes ( failed to login ), and even if it finally works , I just stay in the lobby for a couple of seconds before I get the error and return to the title screen , knowing I restarted the game , ps4 and my whole Internet and it still doesn't work, does anybody know what could be the cause?