Problems with Belkin F5D5231-4 Whilst playing online(PSUPC to be specific)

'kay...first of all, this is my first post so sorry in advance for lack of info and stuff, not very tech-smart at all..anyway.


Well, a close friend of mine just changed ISPs and got a router, like in my title name, the model is a F5D5231-4 Belkin Wired Router.

And since then, disconnections from the game, annoying ones, looking at online times of 5-10 minutes before disconnections. However..that's only when there is heavy activity(if anyone here knows/plays PSU, in essence, we can talk for hours, idle for hours etc, but in a mission when there are monsters, and the fighting begins, the DCs happen).

Forwarded Ports, enabled UPnP(well switched it from the default settings, which should be it), enabled DMZ for a bit, nothing, and stumped, advice please? XD