Can't log in

Hello guys, here's the situation. My friend got a digital copy of Star Wars Battlefront DELUXE EDITION and he has set my PS4 as his primary console, allowing me to use his contents. So, yesterday I tried to log in with my own PSN and I couldn't. The error said: "You must be isgned in to your EA Account to access online features." But then this morning all of a sudden, I was able to play online with no problem at all, on my PSN. When I turn off the PS4 the problem was back again. And not even my friend PSN on my PS4 could log in.

Guys from assistance was very kind, but not helpful. They confirmed my PSN is properly linked with my EA Account and has green status. One of them told me that the problem was that I didn't own the rights to play online, since the purchase was made by my friend's PSN. But the fact that I was able to play for 3 hours this morning disproves this. He suggested me to buy the game with my own PSN, but I know this is a legitimate thing to do in order to share a content. Also, I can play online on FIFA 15 and Battlefield 4 without any problem. And my friend PSN can do this, using the contents I have bought with my PSN. I have problem only on FIFA 16 and Battlefront, games which I don't own with my personal PSN, but my friend's one. Yes, this might you get thinking that's the problem, but then again, I was able to play online, this morning, with my own PSN, for hours, withouth a single issue. I'm really tired of this and I don't know what to do. I've tried everything. The game just doesn't want to connect to servers. The only thing left to do is to initialise the PS4, but I'm not able to store 500gb of data for a backup. I hope you guys can help me.