MBP losses interest connection if left alone

Hi all,
I'm wondering if anyone has any advice regarding this problem I keep getting. Over the last few weeks I have noticed that if left alone my MBP will lose connection to the internet. The Airport symbol shows that it is still connected to the router, but when I try to surf the net, check emails, I am informed that the MBP is no longer connected to the internet and I should check my network settings. The only quick solution to the problem at the moment is to turn off airport, then turn it back on. This reconnects me to the router and I can then resume what I was doing.
I have reset my router, checked connections etc etc... but still seem to have the same result, if left alone (for around 5 mins) the MBP just losses connection.
Not sure if this is related, but I have also been having issues with my Apple TV connecting to the MBP over the same network. The ATV will show up in iTunes, sync, but then randomly disappear from iTunes. This coinsides with drop in connection with the internet. I believe that the problem could therefore be with the router, as a reboot of the router will then reconnect ATV.
The router I am using is a Netgear DGN2000. And have had one replaced thinking this was the problem, only to have the second do the same.
I'm interested to see if anyone has experienced the same problem and therefore has any setting recommendations that could solve my issue.
Many thanks.
- Neil Holmes

etc etc...
Does that include - System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport
Click the Assist Me button
In the popup window click the Diagnostic button.
*No internet connection (wireless)*
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
How to diagnose and resolve Wi-Fi slow-downs
The router I am using is a Netgear DGN2000
Post in the Netgear forums - http://forum1.netgear.com/

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