Why does this happen?
The Registries!!!!!!!!
What happens is that when a name is searched using GoDaddy, it basically checks the registry database for availability, the problem is that not all registries are created equally - I have run into several instances of this occuring with .info - as the registry updated their DB, its often taken offline so that at the time of search Godaddy cannot see if it is available or not, so it processes the order and attempts to register the name for you. Check the registration date on your name.
wirelessnetwork.info was regged - Sept 4th 2006
Did you regg it the same day? or after?
----
Same issue applies with ccTLD extensions, especially ones like .fm who charge a premium for better domain names. (not sure if thats one, but it might be). I attempted to pickup a very nice .fm a year ago, regged it, then it disapeered from my account - because it was never really mine. I had to go to the registry and pay the $1000 reg fee.
I used to work for GoDaddy, so I know. I can also assure you there are no conspiracy's to stealing your domains, I wouldve blown the whistle on that for sure.