USB won't restart :(

My USB-subsystem ist not really that stable I wanted it to be: Sometimes it just stops working (mostly after I locked the screen under GNOME). Now I found recommendations how to restart the USB-subsystem without restarting the whole system:

Code:

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sudo /etc/init.d/udev restart

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it made the following output

Code:

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baruch@baruch-laptop:~$ sudo /etc/init.d/udev restart
 * Stopping kernel event manager...                                                                                                            [ OK ]
 * Starting kernel event manager...                                                                                                            [ OK ]
baruch@baruch-laptop:~$

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without solving the problem. The USB-subsystem still accepted no UBS-devices without restart. Can somebody help me, plz :( :confused: