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DRV10983 pot problem

I have a bldc of mine, While I'm operating with 24v I'm facing a new problem i.e.,when pot reached 70%(near by) of its rotation for varying speed suddenly motor is stopped,if pot rotation is less than 70% motor is rotating at constant speed.At this time my readings are:

V-24, I-1.2, RPM-900.

While I'm increasing pot more than 70% current is fluctuating from(0.7-1.3).

I want to know that why this happens?