Redocs,
I have read the other threads on Intel's website. The drivers I am offering are older drivers, but they worked well when I was using the adapter. From Reading the thread at Ontel's Website, it seems the issue may be with certain routers and/or WPA2 Security. I was using these Recommended Wireless Router Settings using channel 11. If you decide to try the settings, make a new SSID to make connecting easier.
Download the Intel Centrino Advanced-N 6235 drivers and save them to your desktop.
Make a system restore point.
(Windows 8, hit the Windows key and the x keys at the same time)
Start, control panel device manager, network, Right click on Intel® Centrino® Advanced-N 6235, left click uninstall.
Restart your computer.
When you log back in, the new hardware wizard will try to install the adapter but fail. Install the drivers you saved to your desktop.
Try these tweaks....
Start, control panel, device manager. Click on Network and then right click on your wireless adapter, left click properties, power management. Uncheck the box, allow computer to turn off this device to save power.
Go to the power options, and changed the Wireless Adapter Setting, from Maximum Power Setting to Maximum Performance.
Rick