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This can be caused by either software or hardware . If would be helpful if you posted more information such as what you are imaging and what you are writing the image to such as USB external drive, NAS, internal HD or SSD.
Does the error happen immediately or after the backup has proceeded for a while?
Look in the VSS log for the failing job and see if there is any further error information. Apparently VSS issues can cause this error.
Try a different port on the computer and disconnect any other USB devices if you can - assuming you are using a USB target drive.
Look in the WIndows Event viewer, likely System, to see if there is any serious errors at the time of the run.