Logitech USB headset sometimes not detected by pavucontrol

Hello:

I'm not sure if this was reported before.
I have a problem with my Logitech USB headset. Sometimes it was not 
detected by pavucontrol.
The yield is somewhat close to 20% of the time it is not detected.

As of now, all I have is that when I go to Control Center -> Hardware -> 
Browse and Configure hardware, it looks like this:

*****

(When detected)
It is under "USB sound devices":

Identification
Vendor: ‎Logitech

Description: ‎Logitech USB Headset

Media class: ‎Audio|Control Device

Connection
Bus: ‎USB

Bus PCI #: ‎7

PCI device #: ‎2

Vendor ID: ‎0x046d

Device ID: ‎0x0a0c

Misc
Module: ‎snd_usb_audio



*****

(When not detected)
I have two devices under "Unknown/Others":

1]

Identification
Vendor: ‎Logitech

Description: ‎Logitech USB Headset

Media class: ‎Human Interface Device|No Subclass|None

Connection
Bus: ‎USB

Bus PCI #: ‎7

PCI device #: ‎2

Vendor ID: ‎0x046d

Device ID: ‎0x0a0c

Misc
Module: ‎usbhid



2]

Identification
Vendor: ‎

Description: ‎Logitech Logitech USB Headset

Connection
Bus: ‎usb

Vendor ID: ‎0x046d

Device ID: ‎0x0a0c

Misc
Module: ‎kbd


*****


Anybody here knows if there is something that I should take a look at. 
Probably a file or a command line to execute.


Thanks in advance.




PS
System:
Dell Dimension E520
Mandriva 2010.1 x64
pavucontrol 0.9.10
KDE 4.4.3