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DRV10983-Q1: DRV10983 - Open Loop Error

Part Number: DRV10983-Q1
Other Parts Discussed in Thread: DRV10983

I am using DRV10983 for ceiling fan application. I have tuned the motor and started running only in open loop. Motor is started with align method and smoothly starts, once the fan rpm goes close to Open to closed loop threshold, the current shape is not smooth. Closed loop is disabled. I have tried with changing BEMF constant, still it's same.

What might be the cause for this? 

Here's the waveform. The current at open to closed loop threshold speed is not smooth.