Wifi cuts out

[skytbest]

So I don't know if this is a known thing or something I can change. When I'm sitting right next to my router, where there is great wifi signal, the phone will disconnect itself after a while. I'll walk into my house and the phone will pick up the wifi, after a while of the phone being inactive it will revert back to 3G for no apparent reason. Is there a setting somewhere that I'm not seeing that will turn off wifi after a while or is this just an issue with CM7?

I'm on the 12/19 revnumbers build.

Thank you