ISight Turns Off, Must Unplug Firewire

Hello:
I keep my iSight turned off (i.e., lens cap closed, green light off) when I'm not video chatting. I turn it on before initiating each chat or responding to an invitation.
Lately, iSight has been doing a strange thing when I turn it on. It initially works (i.e., green light on, my image on screen), then it dies (green light off, image frozen). No matter how many times I twist and untwist the ring to turn it on and off, it remains frozen.
The only solution I've found is to unplug, then replug, the Firewire at the back of my Mac Mini. This always brings iSight back to life.
Any clues as to why my iSight behaves this way? I assume that it shouldn't.
FYI...I use SightSpeed as my video chat service (**** "XXX will not respond" problem!), but I don't see why that would be the cause.
Thanks for any comments.
Sal

... SightSpeed ... but I don't see why that would be the cause.I do not know why either. Perhaps it is a Possible hardware or software conflicts with another third party component of your system?
Have you recently performed Mac OS X maintenance? If not, try it now, and see if your problem abates.
Have you checked with the SightSpeed Support site for help? If the problem relates to your third party application, their FAQs or Help / Technical Support services should be able to give you suggestions.
The suggestions in Apple's What to do if your computer won't recognize a FireWire device kBase Article may help you if your problem relates to your Firewire ports or to an internet connection that may be holding onto port settings when you shut your iSight off.
If you think the problem might be with your iSight itself, you can check your iSight using the suggestion in How to test your iSight to ensure it is functional.

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