I never had such a problem in windows 7 and 8 but in windows 8.1 I cant use wireless at all !
many peoples have the same problem in lenovo forum.
the connection go offline,limit access,too much lost packets in ping and...!
I also tried to install Intel® PROSet/Wireless Software for Windows 8.1 16.5.3 but nothing changed !
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lenovo y580
intel centrino n2200