There is a check box that will switch this off in Clip Settings in the Log and Capture window. That said it only works with some cameras and not with others.
If the material isn’t being split at shot changes, but randomly in the middle of clips you have a more serious problem, most likely a hardware problem.
All the best,
Tom
Class on Demand DVDs “Complete Training for FCP7,” “Basic Training for FCS” and “Final Cut Express Made Easy”
Author: “Final Cut Pro 5 Editing Essentials” and “Final Cut Express 4 Editing Workshop”