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DRV8872: motor does affect the speed of other

Part Number: DRV8872
Other Parts Discussed in Thread: DRV8871


Customer have encounter an issue regarding their design, please see details below.

I am working on a circuit in which I am using three DC motors whose rated current is 24V. I am using three DRV8872 motor drivers to control each of them but I have noticed very abnormal behavior of motors. If I put more torque on one of the other motor speed decreases so all motor connected with same power rail in the PCB which is VM. I want to know why it is happening? How I can avoid that load on one motor does not affect the speed of other. The value of Rsense resistor is 150 ohm.

It is happening with the earlier driver also which was DRV8871

Thank you in advance.