trouble connecting to wifi

[zsolty szasz]

Hi, 

I am using pfsense 2.2.2 at home. I have a computer dedicated to be a home router which contains a PCI slot wireless adapter with Atheros 9227 chipset. The model of the wireless adapter is TP-Link TL-WN51ND and it has two antennas. This comply with IEEE 802.11n, and provides wireless speed up to 300Mbps according to the manufacturer. 
This adapter was recognized well by pfsense and I have setup with ease in "N" using channel 3 - I live in a crowded neighborhood and I saw that nobody is using channel 3. With this settings the wifi is working fine one or two days but after that I have to do something like "ifconfig ath0 down | ifconfig ath0 up" to work again a couple of days more. The issue is that from my laptop or phones I can see my wifi but I cant connect. I also receive a lot of "ath0 stuck beacon resetting" messages in pfsense. For a couple of weeks I changed back to "G" mode to see if its stable and its working perfectly stable with no ath0 stuck beacon messages at all! 
I really would like to use in "N" because of greater download speeds but I'm lazy to go every time in front of the router and type ifconfig ath0 down/up every time. So please advise me what can I do, or check or setup.
Kind regards,