I'm not sure if you're still experiencing this problem, but I had the same (or at least very similar) issue with my new laptop (Lenovo IdeaPad Y500).
I was able to resolve it by:
1. Going into Device Manager > Network Adapters.
2. Right-click on Intel(R) Centrino(R) Wireless-N 2230.
3. Click on the "Advanced" tab.
4. Click the "802.11n Mode" Property.
5. Change the Value to "Disabled".
I have a Verizon router (or at least my landlord does) and I'm going to assume it's not 802.11n capable.
Sidenote: I also changed the Property "802.11n Channel Width for band 2.4" to "Auto" from "20MHz Only", but I'm not sure if that did anything to help in the issue.
Hopefully this helps some of you.