fedora 10 hangs some time after connecting to ad hoc wireless network

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http://www.linuxquestions.org – I have Compaq presario laptop with Broadcom Corporation BCM4311 802.11b/g wireless adapter. I am using fedora core 10. I am able to connect to wireless routers and browse internet. These types of connections are shown as in infrastructure mode. The problem arises when I connect to an ad hoc wireless network. I am trying to connect with my phone using ad hoc network to access internet. I can connect and browse for some time but after that the system hangs. I can browse normally if I connect to a wireless router. (HowTos)