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Associatted to the AP but can't reach the gateway

I have 8 1230 installed in a building with 2 ceiling antena (ANT1728) per each AP, at the beginning I'm associated to the Wireless LAN but suddenly after a few minutes I lost connectivity to the gateway but I still associated to the AP, after 3 to 5 minutes without any connection I can reach the gateway and the servers of course.

When I'm only associated to the AP and can't reach the gateway, I can make a telnet to the AP and from the telnet can reach the gateway and all my servers, but not from my laptop, any idea what could be the problem??

I have an Intel adapter that I haven't had any problems before in other WLANs, only in this building.