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NRF_ERROR_SVC_HANDLER_MISSING whith uart

When I use the uart to transparently transmit, there is no problem at around 4k/s. When I increase the transparent transmission rate, there will be NRF_ERROR_SVC_HANDLER_MISSING this error in the APP_UART_COMMUNICATION_ERROR event. 

What is the reason, I have been unable to find the reason, if you want a higher transmission rate, what should I do, I do not want to use flow control, dma is not a better choice?

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