If the computer goes to sleep, that will happen - so first check your power management settings. Also, USB connections tend to be quite sensitive to various forms of electrical interference such as power spikes from turning on or off nearby devices etc, so that can also cause freeze ups even if it isn't directly related to the computer itself.
As Don mentioned, printing from an SD card in an Ulticontroller is a more reliable, and faster, way to print.
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donmilne 2
I wouldn't trust a PC driven USB connection for as far as I could throw it. SDcard all the way.
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