[ubuntu] rt2500pci fails to reconnect

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http://ubuntuforums.org – hi there, my problem: wireless disconnects after a few hours, there is a 50/50 chance that the reconnect fails. if it fails i am asked for the wpa2 key, if i hit cancel and try to connect manually after 2 minutes it connects most times. if i enter the wpa2 key and hit connect i won't get any connection. reading the loglife of my router shows that my laptop connects and disconnects in a 7s rhythm. a restart solves this problem (is there a command to manually restart the network without the need to restart? laptop: packard bell easynote w1000 ubuntu 9.10 lspci -v readout: Code:         Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)         Subsystem: RaLink Device 2560         Flags: bus master, slow devsel, latency 128, IRQ 21         Memory at c0000000 (32-bit, non-prefetchable) [size=8K]         Capabilities: <access denied>         Kernel driver in use: rt2500pci         Kernel modules: rt2500pci kern.log shows "phy0 -> rt2500pci_set_device_state: Error - Device failed to enter state 1 (-16)." twice every minute probably related, after suspend or hibernation networking is disabled, enabling it via right-click does not work again after a restart everything works how it should. thanks (HowTos)