Hi Stefanie,
Is it only one particular job struck all time, Or is it like a random job.
If it is one particular job means, can we know what that job does, whether it has an ERP API's or just any DB insert or what kind.
If it is one particular job means, may be u need to check on programming end as well
Check on DB size , if your transaction is doing any command query.
Or any ABAP table which might be missing index's or taking more time to do the operation.
Regards,
Padma Rao.