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CC2541: SPI

Part Number: CC2541
Other Parts Discussed in Thread: MSP430FR5969,

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CCS/MSP430FR5969: Function call

We have additionally added CC2541 chip for BLE operations.(Host - MSP, Controller- CC2541)

And, SPI interfacing between MSP and CC2541 is working for 90% of boards(Max. no. 100). But, for 10%, the SPI data was not received in CC2541. How is this happening. We are flashing the same working firmware in this 10% of boards. But its not working. Can you tell us the reason behind this?