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PMSM sensored low speed bumps

Hello,

I am working with TMDSHVMTRPFCKIT, PMSM sensored project.

at BUILDLEVEL=4, when I set SpeedRef to <200 rpm, rotor rotates with bumps. On oscilloscope I see that bunps occure when Electheta=0.

I looked for answer on http://e2e.ti.com, found some posts - but none have solution. 

http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171/t/49954.aspx

Does anybody have ideas?