I know this with 3.6P1, but we have had following Problem after the upgrade to 3.6.
Thread Link : 23803
We will open a case about that, but in the moment we are migrating all our oracle DBs to Netapp/snapcreator and so we haven't time to investigate this Problem...
But thanks anyway. You are the first we will inform, when we running 3.6P1 :-)..