One of the new problems people often see now is WiFi congestion when there are too many WiFi Access points (AP's) around them. When you see your system dropping the WiFi and reconnect it's likely something is stepping on your frequency or channel that is stronger than your AP from that given location.
Most people leave their networks AP at the default automatic channel setting so its not uncommon to see some bands become to noisy to support a connection causing the AP to reconfigure it's self to a different channel or band (dropping and then reconnecting). I bet your AP is near your desk and the farther you get away from it you encounter more problems and your likely getting closer to a common wall with your neighbor who has his own AP.
First get a WiFi finder app [http://istumbler.net/|iStumbler] for your laptop so you can see the used frequencies and channels around you and the strength.
Some of the things you can try is altering the frequency your AP is running and manually select a channel. Using 5GHz frequency will have limitations accessing the AP from a distance but less likely to be conflicted with.