NX Tool orientation in pocket and working angle settings

Occasionally (and fairly randomly) when setting the turning tools, at some point the tool rotates and is no longer on the work plane. If I delete the tool out create a new one then it will work ok for a while then it will suddenly rotate again as below.

The system expects a Working Angle definition even for the first pocket MCT_POCKET_1. Working Angles should be defined for all pockets (even if the value is set to 0) under the Turret. If the working angle is defined at 0, the grooving tool orientation is working as expected.