IWN: unstable connection

I have a device:
Code:
iwn0@pci0:3:0:0:        class=0x028000 card=0x40628086 chip=0x08878086 rev=0xc4 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Centrino Wireless-N 2230'
    class      = network

This device is connected to WPA2 network using wpa_supplicant.

Sometimes, device loses connectivity with

Code:
iwn0: null_update_chw: need callback
wlan0: link state changed to DOWN
wlan0: link state changed to UP

Sometimes, this recovers over 1-2 minutes; sometimes, it just drops connection and never reconnects till reboot.
This problem was not experienced previously on Linux, at all, so I'd suppose that hardware itself should be alright.

What could be done?
 
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