Job is not getting triggred in source system

Hi All,

At times, while executing my infopackages I could not able to find the job in source system.. It is not getting triggred in source system, when i repeat the load twice or thrice.. then it is getting triggered and done.. some times jobs are triggering fine ..what could be the reason for this . how to rectify it? ..

Thanks in advance

Br,

Harish