Battlefield 5 PS4 disconnection issues

Really hoping someone can help. I've started playing..well attempting to play Battlefield 5 on PS4 again but can only ever join games for a minute before I'm disconnected.

On the occasional day, I could get two or three full rounds on multiplayer in, but in most circumstances the game is unplayable which is very disappointing.

I uninstalled the game so I can install on the PS4 HDD not the external drive it was on. Waiting for it to download, I booted up Battlefield 1....same issue!!! Disconnecting from server.

For clarity, I'm on 150mbps internet (90mbps) to PS4 via Cat6 LAN cable.

Talk Talk internet

Eero router (which I hate and suspect may be the issue)

Tried, logging out of psn and back in.

Tried restarting PS4 multiple times.

Tried restarting router multiple time.

At a loss and really need help.