Zyxel, MacBook & WiFi troubles

As you know, I'm a happy owner a Apple Macbook. Also, for home mobile development ;-) I get Zyxel 660HTW2EE (ADSL modem + router + WiFi).But my happy wasn't long ;-(MacBook drop WiFi connection every 30-60 minutes (when WPA2-PSK). Or drop connect and Zyxel make could restart (!). And I have 3-5 minutes without Internet, without network (terrible! ;-)When I'm switching into WPA-PSK mode, I get stable connection, Zyxel hasn't restarting. But speed is so slow ;-( max - 110KB/sec (It's 802.11g mode!) Terrible..After reading a lot of forum/blog and manuals I switch off any WPA, and setup MAC-Filter for my MacBook. Now I have stable connect. STable working of Zyxel, stable Wifi in MacBook.You may ask me - why you don't by AirPort from Apple? I have answer ;-) Because AirPort doesn't have ADSL modem ;-( Yep. In my region we using ADSL internet. still... So, If you happy from your Zyxel & MacBook - switch off any WPA/WPA2 coding, setup Mac Filter and have fun with WiFi Internet on  your notebook...