I use wireless for connection to mine, and it does not disconnect at all unless I hit the timeout.
If you're in an area with a large amount of Wifi, try changing your channel to the lowest or the highest as many default to somewhere in the middle. There should be less interference there. Also look at the distance and obstacles between your AP and your PC. If the AP will run dd-wrt, then you should probably upgrade to it. My linksys stuff running the stock firmware sucked, but works great on dd-wrt.