Hey Russ, thank you for pointing out K3CCD Tools; I'll give it a try. My Firecapture has begun to freeze up too after about a thousand frames requiring a complete restart, just like your situation.
To reduce the USB traffic look under the "Control" section of Firecapture v2.3 (beta 08). Beneath the word "Control" you'll see three words, "Gain", "Exp" and "Gamma". Next to "Gamma" click on the little triangle; in the 5th line you'll see the control for "USB Traffic" with a slider or up and down arrows that you can adjust.
Thanks,
Pete