My wireless disconnects constantly

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http://crunchbanglinux.org – Hi. I'm using crunchbang since a few months ago. I love the usability and minimalism of it. The only problem I have is with the wireless card. lspci -nn | grep Network01:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)The wireless works, but suddenly is disconnected :S with no possibility to connect again. I've tried to down the interface (wlan0) and up it again, restart network-manager, deactivating and activating the wireless and nothing. The only solutions that seems to work is restarting the system (wich is not (HowTos)