I've had similar problems with several different Windows laptops on several different Windows versions. Every now and then they lose their connection to the internet - not to the router, just to the internet. Things that have fixed it at various times - deleting the entry for the device driver and recreating it with an automated hardware scan; Reverting to the Microsoft version of the driver; Fiddling with the device driver settings (hate doing that). I suppose it comes down to mismatches between the OS, device drivers and hardware produced by different companies at different times.