Please follow the below mentioned steps for WiFi problem with Intel® Centrino® Wireless-N 2230:
-Press and hold the Windows Key and then press R to launch Run Dialg box.
-Type “powercfg.cpl” and hit “Enter”.
-Click “Change plan settings” above the selected power plan.
-Click “Change advanced power settings”.
-Scroll down to “Wireless adapter settings”.
-Click the + sign and ensure that the wireless card is set to “Maximum Performance” when running on battery as well as AC Adapter.
-Click “OK” and close other power setting windows.
-Repeat steps 1 and 2 and this time type “devmgmt.cpl” in the Run Dialog box and hit “Enter”.
-Expand Network Adapters, right click the wireless card and choose Properties.
-Click the Advanced tab and Change Roaming Aggressiveness to Lowest.

oh they changed me from Intel® Centrino® Wireless-N 2230 with Realtek® network card.

its free, you just made a story of complain and ask to change, when the approve for change, ask for the realtek card. not intel.

Same like mine!!!! but i5-3337U with 2GB Nvidia.
Husband using Mac Air, mine also the same as his unit.
So happy with this model and version.