fast growing db2diag.log (FP4 V9.5)

Does anyone have experiences with V9.5 FP4SAP?

We have implemented this FP4 last week (from FP2a). Since this a db2diag.log of about 1MB were written (and the system usage is really low).

We have another system on FP2a which is used heavier (as a productive system) and the db2diag.log is about 2,5 MB within two months.

We have checked SAP note 1086130 for DB parameters and did not find a required change (from FP2a to FP4).

Any idea is welcome!

Best regards.