Sorry to hear it. Did it stay alive longer? If it did, how much longer? A day, a few days? Try this; open up Terminal and paste this command then hit enter. Do it when you're about to go to bed and let it run until you come back from work or when it usually goes down.
ping 192.168.0.1 > Ping.txt
Make sure that's your routers address. It could also be 192.168.1.1. It will always have a 1 at the end (because that's your gateway). When you want to stop it hit Control+C. It will create a file in your Home folder called Ping.txt which you will be able to open with the text editor. It will keep your connection alive and your network working. It will also show how long it takes if it does go down. The file shouldn't be too big, even after a day or two of this.
Also, please give use the exact model of your wireless router.

