We have five devices on our home network. A Dell desktop (Ubuntu 12.04 LTS) is connected to a router by wire, and three laptops (Windows 7, 8 and Ubuntu 12.04 LTS) and a wireless Sony Bluray player. The router is a Cisco Linksys E900.
Our internet connection for the Dell is solid and reliable and we never have any problems with it.
However, the connection for the wireless devices seems to come and go as it pleases. Some days there are no problems and other days it takes hours to connect. I just spent about two hours fiddling with the Ubuntu laptop before it just decided to connect. In every case, the radio indicator on the panels show a strong signal, but there is no internet, even while I'm using the Dell to surf. Then it shows up for maybe a minute, then goes, and comes back.
I plugged the Ubuntu laptop into the router by wire, and the connection popped on instantly, and I was able to browse in Firefox. When I unplugged it, the laptop went back to on off, on off.
I bought the E900 because it had a higher bandwidth capacity than our previous router, and it worked for the past year with no problems, until a few weeks ago. I honestly don't know what happened to change this.
I need to fix this once and for all, and would appreciate any suggestions about what to look for.
I checked the IP addresses of all the devices, and they are all different.