I had been having issues of being disconnected with my Linksys router. After installing the firmware, and it didn't correct it, I found out it was the channel that I needed to change as well. You may need to do this because others nearby may be using the same channel, and it can affect your connection. This is how to change the channel. It is very easy.
Click on the link.
http://192.168.1.1/

The user name is left blank, and the password is admin.

Once you are connected, click on the Wireless tab, and under that Basic Wireless Settings. You will see a drop down box, that says Wireless Channels. I am now using channel 11, which works well. So, I suggest you use that, and click on the Save Settings Button. That should fix the issue. Very easy!