I am sorry to hear you experienced this problem. It would be very useful for us to see the files and provide any other details that you can tell us, such as time interval between samples, number of samples being collected, if you have noticed it again in other runs. The number of files created. What are the voltages being measured and are they correct.
Please also state the operating system being used.
Once these details have been recieved we will be in a better position to comment.
Please send the file to email@example.com