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Does it disconnect only when you aren't using it? If so, it could be the power saving settings for the wireless adapter. Check it in Control Panel>Device Manager, right click to expand network adapters, right click the wireless one and go to Properties then Power management.
If it's not that, it may be the channel it's set to receive on if that doesn't match the channel the router is broadcasting over.
Hey. It does disconnect exactly when I'm using it. And it pisses me off. I've called to Samsung and they offering me send it to warranty.. They're kidding me.
I also checked all system updates, only one was affecting my wireless card driver, so I tried restore laptop before this update - but still same ***.
And also what I noticed, when computer is just turned on, wireless works without interruption for like few hours at least. But if laptop is on for more than 2 hours, disconnects starting.