Wifi gets down, when connect to my MAC

When I connect my MAC to my wifi's home... the wifi connection gets down...(the network appears and disappears in all of the devices that are already online)... I must restar at least 2 times the MAC to get connected.

I'm suddenly having a similar problem: I'm running Mac OS 10.7.3, iTunes 10.5.3 and iOS 5.0.1. When I plug in my iPhone, system.log reports:
Feb 18 16:29:51 lianaslaptop com.apple.launchd[1] (com.apple.usbmuxd[685]): posix_spawn("/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/ A/Resources/usbmuxd", ...): No such file or directory
Feb 18 16:29:51 lianaslaptop com.apple.launchd[1] (com.apple.usbmuxd[685]): Exited with code: 1
Feb 18 16:29:51 lianaslaptop com.apple.launchd[1] (com.apple.usbmuxd): Throttling respawn: Will start in 10 seconds
When I go to that location, sure enough - there is no usbmuxd. I haven't been messing with my system, I've never poked around in places like this!

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