Need to reboot wireless router to connect device on wi-fi

Need to reboot wireless router to connect device on wi-fi

I have Asus NT10e wireless router. I connect wi-fi enabled device on router. After disconection I can't connect second time till router reboot. On router web interface in System Log device is associated and deassociated.
May 20 03:43:06 wlan0: A wireless client is associated - 9C:02:98:0E:BF:D7
May 20 03:43:06 wlan0: WPA2-AES PSK authentication in progress...
May 20 03:43:06 wlan0: A wireless client is associated - 9C:02:98:0E:BF:D7
May 20 03:43:06 wlan0: Open and authenticated
May 20 03:48:43 wlan0: A wireless client is deauthenticated - 9C:02:98:0E:BF:D7
On clent list device is still listed
Client List
Type    Computer Name   LAN IP  Block
[Other Device]  Local Device    192.168.2.22   
[Other Device]  9C:02:98:0E:BF:D7   192.168.2.221
Firmware is latest 2.0.0.19
Please help