I have a AIR-AP1131AG-K-K9 installed in Korea and it's configured in LWAPP/HREAP mode. All laptops can connect to the 802.11bg radio. Some laptops can connect to the 802.11a radio but no Lenovo T61 or X61 laptops can connect to the 802.11a network. The Lenovo machines don't even see the 802.11a signal in the air. Any tips?