There could be some self intersecting curves so the model feature is not working.
You might use the checkmate test for sketch a bit.
I would recommend making more sketches, and have each sketch simpler.
I.e. have a sketch for pocket "A", and a separate sketch for pocket "B"
Production: NX10.0.3.5 MP5 + patch/TC11.2
I'd rather be steemed than diseaseled
If your sketch has intersecting curves by design, the "region curves" or "stop at intersection" selection options can help select a valid section.