hquezada,
Consider increasing RBW or using the Nuttall window (rbwShape parameter on bbConfigureSweepCoupling) if the device is unstable at low RBWs like 1Hz. It looks like your PC is unable to keep up with the processing required for the 1Hz RBW on the BB60C. Unfortunately RBWs that low on the RBW require significantly more processing than other measurements.
Regards