1.  But some people like to turn to do other jobs, they enjoy challenging themselves, they will gain different joy from a new job, they possiblely work better in the new position .

2.  Secondly they also make many new friend in the new position.

3.  Because they think different job can bring them different feeling, if they have a new job, it will make him a new position, the other side , a fixed job is no taste, it would make man a bad behavior, lose the interesting of the living .