sinamics g120 wont start - motor not run its only toggle forword and reverse

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Split from sinamics g120 wont start.

i have same problem

sinamics g120 with profibus.and some today we face some problem.when we start the drive from operating panel.the motor not run its only toggle forword and reverse. for 2 sec. and some time the motor start normaly.we. have checked control word and set point in simens scout by takeing online the drive.all signals are ok.but still some time motor not start.it only takeing current and forward run 1sec and reverse run 1sec. and toggle.

withe me when i increase p1080 from 0 to 1,2,3,4,5 the motor running

please help me how to solve this problem.