D-Link DI-604 router question

[Dbest]

Hello everyone, I think it's like my 3 post on the networking forum (feels weird :P), anyway, so I recently bought this router (D-Link 604) and I'm having a problem but I don't know if it's because of the router or my ISP. So the problem is the following, when I start browsing the web let's say for half an hour and then I just quit doing it and come back an hour later and start to browse again the browser gives me a network problem. It seems that it can't find my ISP dns server, because this only happens with web pages, the funny thing is that the instant messaging client keeps connected also peer to peer programs. Any ideas ? If you need to know here's how it's setup, the router is cloning my MAC and acting as a DHCP server, dynamic IP (cable). Is this the cable's company's fault or is it the router? Any help will be appreciated as always.

I forgot to mention that if I reboot the router then everythin returns back to normal weird ?

[Beemer]

Your routers manual has a phone # to call D-Link. Their tech support is great and you get it for 1 year from purchase date. Try them. They have been pretty helpful with me at times. They'll be able to find if it is the router or the ISP.

Cheers!

i assume the you are connecting with the wireless?

do you have the latest firmware installed onto the router?

[Dbest]

Beemer:
I'll try to contact D-Link about it, thanks .
GroundZero3:
No, it's not a wireless router, and there is a firmware upgrade on their site but it says that it locks the WAN port to 10Mbs, and to use it only if your having trouble connecting. I'll contact D-Link and see what I can dig out of this.

Thanks for the help everyone .

[Dbest]

I forgot to update my own thread . So, I got the issue fixed, it turnd out to be my firewall it was dropping the packets sent by the router on a specific port, can't remember it right now. So, everything turn out just fine . Thanks everyone.