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This is most likely due to comms/timing issue with the camera. If it was a one off event I would not worry - if it is recurrent then...
If, like me, the laptop you use when imaging is your work machine it is good practice to remove all non-essential programs/hardware from the PC (firewall, virus scanner, screen saver and others can all be suspects here) and do a re-start before any imaging run, also it is a good idea to use the exact same sequence for connecting up all your cables and starting you software....
If you have multiple cameras connected to USB ports on your machine it is a good idea (if possible) to connect them such that they use different physical controllers on the PC - some systems can have issues if the imaging camera downloads a frame at the same time as the guide frame. A powered USB hub can help - this is your camera does not have a separate power supply and draws its power from the USB cable and of course make sure you are running the latest drivers for your USB controller(s) and cameras...
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