I got this 16 GB flash voyager for several months . It has a strange problem now . Every time it only last about 20 second when I plugged in . I could copy and open files during that time , but then I can not access the voyager and everything on the voyager disappeared .
According to the above context, choose the best option to answer the following question.
Question: What sort of problem might this be ?
Options:
- a software error
 - None of the above choices .
 - Human error
 - An accident


a software error