MBP Stops Connection to the Internet

Hey,
So I just got a new Mac Book Pro and have been having problems with the internet. I am using an airport extreme for my internet and have wireless speakers set up in my room with an express. For some reason when ever I try downloading media on itunes or stream a video my internet cuts out after about 20-30 min. My wired connection work fine throughout the house but my wireless goes down and I can connect to the internet with any device. If I restart my comp then it works fine. I have had the extreme set up in my house for a few years now and when I just added the express it seemed to have started this problem. Would there be an IP conflict or something, its not a big problem but would like to understand why it happens,
Never posted on the forums before but hopefully someone might understand the issue,
Thanks,
Scott

"Dynamic WDS" is not a selectable option, not directly at least. It is the default option for extending a 802.11n AirPorts and became available with those models.
To create a dynamic WDS or "extended wireless network" with a pair of 802.11n AirPorts, you just need to select the options I mentioned earlier on each base station.
The following is the basic setup steps that you can use to see if you missed anything when configuring your base stations:
Dynamic WDS - Extending an 802.11n AirPort Wireless Network Setup
If practical, place the base stations in near proximity to each other during the setup phase. Once done, move them to their desired locations.
Open AirPort Utility, and then, select the base station that will connect to the Internet.
Choose Manual Setup from the Base Station menu, or double-click the base station to open the configuration in a separate window. Enter the base station password if necessary.
Click AirPort in the toolbar, and then, click Wireless.
Choose “Create a wireless network” from the Wireless Mode pop-up menu, and then, select the “Allow this network to be extended” checkbox.
Next, select the base station that will extend this network, and then, choose Manual Setup from the Base Station menu, or double-click the base station to open its configuration in a separate window. Enter the base station password if necessary.
Choose “Extend a wireless network” from the Wireless Mode pop-up menu, and then, choose the network you want to extend from the Network Name pop-up menu.
Enter the base station network and base station password if necessary.
Click Update to update the base station with new network settings.
(ref: Pages 43-44 of Apple AirPort Networks.)
Also, for better network bandwidth performance, I would suggest that you change your wireless security to "WPA2 Personal."

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