Diagnosis
An end-date for the job is specified when the job is scheduled (nolonger "start after date/time").
When the job is started for the first time, this end-date is applied toALL subsequent periodical jobs.
This is different to the standard SAP batch schedulings.
The end-date is checked each time the job is restarted, and if theend-date has passed, the job is removed from the schedule.
This is what has happened in this case.

Procedure
Reschedule the job if you want to keep it running.