Wifi always disconnected.

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http://forums.fedoraforum.org – Hi there, I bought a Compaq CQ58. I try many distributions, only Fedora 18 seems to work almost out of the box, and with free drivers. I have only a problem. I use network manager, I can detect my ap, connect to it, but I am disconnected few seconds after... My wifi / bluetooth device is a pci Ralink 3290 : Code: 04:00.0 Network controller: Ralink corp. RT3290 Wireless 802.11n 1T/1R PCIe         Subsystem: Hewlett-Packard Company Device 18ec         Kernel driver in use: rt2800pci I searched, I have found post with the similary problem, (HowTos)