studio hybrid 140g wireless card problems

my studio hybrid computer when started it is directly connected to the wireless network with no problem. but sometimes it looses its connection, and it does find the wireless access point, although next to it is a laptop computer which shows that the access point is available. i did not have any problems with my previous computer and only with the studio hybrid. also when i restart thecomputer it is connected to the wireless access point. any suggestions?

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