I have a netbook that occassionally, usually once or twice a day, maybe more, will lose its internet connection while I am on Skype (that's when I notice it most, it may happen more often). The little yellow dot appears over the networking icon in the system tray, which when I click on it says no internet access at the top of the popup menu, and next to the router connection that I have.
Disconnecting and reconnecting usually rectifies full internet access again.
I'm not sure if leaving it for any amount of time allows the netbook to automatically reconnect again.
Everything seems fine with my laptop. I don't think this loses connection in the same way.
I'm using Windows 7 home premium.