Job to maintenance plan is running endlessly

Hi Guru,

I have created a job to schedule my maintenance plan (SAP PM) to create automatically the maintenance orders using the t-code SM36 using a variable of IP30.

This job executes daily at 3 AM. However sometimes this job keeps running infinitely without finish. When this happens is necessary cancel manually.

I don't have any idea what can be causing that because sometimes working fine and other not!

Does anyone have any suggest about this issue?

Ths

Wagner Silva