WRV200 + WebSTAR DPC2100 = Internet Connection lost?

I have a Linksys WRV200 with firmware 1.0.38 (http://www.cisco.com/en/US/products/ps9930/index.html)
The router is set to "Automatic Configuration - DHCP" to get ISP IP.
I also have a WebSTAR DPC2100 cable modem with an argentinian ISP called Fibertel (http://fibertel.com.ar/).
More information about my modem:
Tx: 41.7 dBmV
Freq Tx: 28600 MHz
Rx: -5.5 dBmV
Freq Rx: 567000 MHz
MER: 36.8 dB
Equipo: WebSTAR DPC2100 Series Cable Modem
Descripción: S-A WebSTAR DPC2100 Series DOCSIS Cable Modem Ethernet+USB <>
Versión OS: "v2.0.2r1244-050506-CVA2"
I have computers connected to my router:
2 computers with Intel WLAN and LAN cards
1 computers with Broadcom WLAN and LAN cards
So, my problems is this...
I'm trying to download a 1.5 GB file from MSDN Academic Alliance Software Center (http://www.e-academy.com/).
When I start the download, after more less an hour of download: the conection stops.
No more download.
No more Internet on any computer connected.
Also, the router shows no IP address from my ISP.
To get back my Internet connection, I have to unplug from the power the modem and the router. Plug them back... and everything back to normal.
But, I don't have this problem when I'm only browsing the Internet.
So, this only happends when I'm downloading... from one peer (as the example) or from multiple peers (P2P).
This happens no matter I'm using WLAN or LAN conection.
Also, this doesn't happend if I connect a LAN cable directly to the modem.
Any Ideas?
Thanks in advance for your help!

These products are being handled by the Cisco Small Business Support Community. (URL: https://supportforums.cisco.com/community/netpro/small-business)

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