1)
Don't use a network hard drive. The program is not designed for it.
2) I assumed that it was/is video that you took. If not where did you get it? What format?
3) Does loose parts mean blanks in the story boards ?
What else do you have running when you are encoding the video. If you are using a network drive or even a external hard drive, your antivirus may be taking attention away from the encoding to run the scans. Turn it off for a short time to make sure this is not the problem.
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.