Dropped wireless on Android? I currently have a Droid Incredible (Froyo with ROM: Skyraider 3.5 w/ Sense)  

For a while now, my wireless connection on my Droid Inc just drops and switches over to 3G  even though wireless, on both the router and phone, are still on. All my other devices connected wirelessly are still connected and functioning. I had this problem on pre and post rooting and ROMing.  

What could be the root cause of this?  Has any other Android smartphone experienced this? 

Is there a feature/app that could warn you that your wireless has dropped and is switching over to mobile network and vise versa.  I only ask because the switch over either way is seamless and can be annoying when browsing or downloading apps.
After reading a bit this seems to be a pretty common issue with folks who are running Skyraider on their devices.  I don't know exactly what they're talking about, but apparently your radio needs to be the right version in order for your WiFi to act properly.  This thread over at IncredibleForum looks like it might be where you need to start.