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UART communication FIFO error

OS in development environment :Windows7
HARD :(Taiyo Yuden)EBSHSN Series Evaluation Board : Central / Peripherals
CPU :(Nordic) nRF52832 / ARMR Cortex-M4F 32 bit processor 28-pin Land Grid Array / 15GPIOs / SWD
Soft Ver:nRF5_SDK_15.3.0_59ac345

Because a UART FIFO error has occurred in the device currently under development,
Confirmed the operation of the sample program.
We communicated with the sample program of ble_app_uart_c and ble_app_uart.
result:
If 2kbyte data is transmitted continuously, a FIFO error will occur regardless of whether or not flow control is performed with the UART.
Please tell me how to take measures.

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