I have a Trendnet TEW-432BPR router connected to an ADSL modem and from there I go to the internet. The problem is that when I connect directly from PC to modem and open a session with putty navigate fluid, I can leave open the putty session for hours and still ok. But if I connect the PC to the router and this in turn the modem, when I open a session with putty that is blocking it constantly, every 5 minutes or a short downtime in the putty. I guess it can be problem router configuration, which configuration variables may be causing the problem?
It can also be your internet's server problem.