SYS_STATUS_RXSFDTO when range

Wireless Connectivity Ultra-Wideband
1

Hi,
Now the range is work with the STM32l051 MCU@16MHz clock frequency and 16MHz SPI baudrate, but it appears SYS_STATUS_RXSFDTO（0x04000000） at the rate of 3% in dwt_isr.
Who have encountered this question or know that how to solve the problem?

Thank you.
Best regards

2 
It is simple to write, i create aother topic again.