There are loads of reasons that an RF (WiFi) network connection could fail and then reconnect, it's the nature of the beast, but let's look at the most obvious causes :-
1. HOW FAR IS YOUR COMPUTER AWAY FROM THE RF TRANSMITTER ?
Move the computer nearer the RF tranmitter. If the problem still occurs when the two items are within 2m of each other, it's unlikely to be a signal strength problem.
2. WHO ELSE HAS AN RF NETWORK NEAR YOU ?
RF network channels overlap each other. Many manufactures of RD ADSL routers tend to default to channel 11. Check what RF networks can be found in your area, and change your channel to the least used one.
3. IS IT REALLY THE RF NETWORK, OR IS IT THE ADSL SERVICE ON THE PHONE LINE ?
This is slightly more complicated to check, but the logs within your ADSL router should show when the line has been up or down.
Check these three possibilities first, it will save you at least an hour of a PC engineer's time.
Pete, August 2007