Hello, I was using my santa rosa MBP 17" in a cafe. When I put the laptop on the desk, I could use the internet without problem. However, as it was not comfortable to bend my back, I put it on my lap and used the machine while sittng on the sofa. Interestingly, internet connection dropped suddently. I clicked on the AirMac icon on the top right, the name of the router which I used (when the laptop was on the desk) disappeared. Other names came up. When I put the machine back on the desk, I could use the internet again without problem. Anybody knows what is going on? For you information, I was sitting next to a large window. This happened on different days at the same location.