Microsoft Lifecam Studio stops being recognized while connected

Good day,
We are using Microsoft Lifecam Studuio webcams with Windows 7 PCs to faciliate desktop VTC with Polycom's CMA Desktop. The PCs are multi-user. We are finding that, without touching the webcam, it is stopping to be recognized by the O/S for some unknown reason,
requiring the user to unplug and reconnect the webcam for it to be recognized once again. This is inconvenient as the users do not have easy access to their PCs, nor do we expect that this should be a regular requirement for a peripheral device, once connected
it should remain active.
Are there maybe firmware updates for the Lifecam or a driver update that should be used to correct? (Currently using 6.1.7601.18208) Is the webcam being affected because of multi-user sessions?
Thanks for any advice.

Hi SA Stewart ,
"We are finding that, without touching the webcam, it is stopping to be recognized by the O/S for some unknown reason, requiring the user to unplug and reconnect the webcam for it to be recognized once again"
Do you mean this device will stop working when we try to switch the user or it just stopped suddently ?Will the issue occur regularly ?
We can download the latest fireware update and software for the device here .
LifeCam Studio
http://www.microsoft.com/hardware/en-us/p/lifecam-studio/Q2F-00013#support
If the issue occured when we try to switch the user ,I suggest you to stop the process which is occupying this device from the task manager before we switch the user.
If it is possible ,we can try to connect the device to another machine to verify whether this issue only occurred with this specific machine .
Best regards
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