Why have you had so many jobs?
Your interviewer fears you may leave this position quickly, as you have others. He’s concerned you may be unstable, or a “problem person” who can’t get along with others.
BEST ANSWER: First, before you even get to the interview stage, you should try to minimize your image as job hopper. If there are several entries on your resume of less than one year, consider eliminating the less important ones. Perhaps you can specify the time you spent at previous positions in rounded years not in months and years.