Router looses connection with modem

My WRK54G wireless router keeps losing connection with my Comcast broadband modem. My connection with the router remains, but I lose internet connection. After rebooting the modem and router, my connection lasts no more than 5 minutes.
I tried to upgrade my Firmware but it did not install corrctly. (error during upgrade).
Any ideas on what I can try?

If you loose the connection on all the computers(wired and wireless) then, you should connect a computer straight to the modem and test the internet connection...See what happens and if you face the similar problem then it is not your router...
If you have stable connection straight from the modem, then, you should upgrade your router's firmware...
As the upgrade failed, you need to download TFTP Utility...Also download the router's firmware from here , make sure you select the correct version and then download the firmware...
Double click the tftp.exe file and click run :
For Server- Enter the IP Address of the router that you assigned. By default, the router is 192.168.1.1...
For Password- Enter the password you assigned the router. By default, the router’s password is “admin”.
For File- Click the triple “…” button and browse for the .bin firmware file...
Click Upgrade button to start upgrading. A progress bar should show up to show the progress.
Once the Upgrade is done press and hold the reset button for 30 seconds...Release the reset button...Unplug the power cable from your router, wait for 30 seconds and re-connect the power cable...Now re-configure your router...

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