Sorry, I don't seem to be having any issues like you are having. My wireless connection has been pretty stable. I am not even sure if the type of data being sent over the link will necessarily have an impact on your connection dropping or not.

The only thing I could suggest is that you try these applications when you are right next to your wireless router and see if it's a reception problem. The lower the signal the laptop receives, the slower the data rate that the wifi will transmit at. For data intensive applications, this may cause the connectivity issues you are experiencing.

It's just a shot in the dark though...