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my problem is that my wifi disconnect sometimes after 5 min, 30 min or 3 hrs if i have lucky. i installed Ubuntu 12.04 64bit in my notebook.

Info:

merickk@merickk-HP-ENVY-15-Notebook-PC:~$ lspci | grep Network
05:00.0 Network controller: Ralink corp. RT3290 Wireless 802.11n 1T/1R PCIe

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
05:00.0 Network controller: Ralink corp. RT3290 Wireless 802.11n 1T/1R PCIe
05:00.1 Bluetooth: Ralink corp. RT3290 Bluetooth
06:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader (rev 01)

I tried this How do I get a Ralink RT3290 wireless card working? but dosen't work

How can I fix this?

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