Sudden incredibly high ping (PS4)

Whenever I play solo Firestorm I get alot of lag, I come in games where there are alot less people than the actual 64. For example the last 3 games were: 

1st game: 8 players

2nd game: 31 players

3rd game 22 players

When I play squads, everything is perfect. Same goes for the rest of whole BF 5, it's without lag. Only solo Firestorms does these weird things. It seems like it is connecting me with a bad server. Literally EVERY GAME I play I get the logo's on the right side of the screen and my games lags alot.

My cousin also plays BF 5 (we play alot together), whenever he plays solo there is absolutely no lag. He does not have this issue. He lives very close to me.

I play on PS4

Is there a fix? Is this a bug? What is this?

EDIT: I live in the Netherlands in the city called Enschede (very close to Germany)

@jess074  @momoro-bes 

I'm sure you've already tried but want to confirm basic steps don't work - Can you let me know if these steps below work? Do you get the same results if you play on a wired connection if you're on WiFi?

Try rebooting your network and power cycle the console.

Reboot the power to the modem/router

1. Unplug the power cable from your modem/router for 5-10 minutes to refresh the network.

PS4:

Power Cycle

1. Touch the power button on the front of the PS4 for at least 7 seconds (until the system beeps twice).
2. Turn it back on after 1 minute. Launch the game.

Connection Troubleshooting

https://help.ea.com/en-us/help/faq/connection-troubleshooting-basic/