Do you mean when the phone sleeps the WiFi is dropped? If so, go to settings/Wi-Fi then hit the menu button and choose advanced. There you will see the setting for keeping Wi-Fi on during sleep. I have mine set to always.

Codegerm

 

That is quite odd. I am running on FK23 stock rooted and am having no issues. What one are you on?

 

I would say try first rebooting your wireless router first. I have run across issues of the router causing problems like that, with one thing is connected fine and something else having issues. If that don't work maybe a re-flash of the ROM may bee needed.

 

Cool, glad that was the issue. It is a lot less annoying to fix than re-flashing ones ROM. I use the self healing option on my router which does the same thing on a schedule.