Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

20 days ago I bought a D7, although my old Netgear DGN 2200 still works, in order to boost the Wifi signal coverage and for the additional functionality.
It's a sort of nightmare.
First of all, when I download at high speed, randomly it loss the ADSL carrier.
But the thing that make me more furious, it's that it works very bad with PSN.
I have a PS4, connected to the router via Wifi.
I have many problems with connection and when I am connected, ingame I'm often disconnected.
Note that when I play with PS4, only my neXus 5 is connected to the router.
I contact the support and they send my a video to configure the router in order to have Nat 1 connection, but It works very bad anymore.
With the Netgear, despite the Nat 2 connection, the PS4 works well, it connects at the first try and no disconnection.
I have also installed the august last firmware revision.

What can I do?