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ERRORSRC 0x1 on UART handler

Hello,

On my custom board, I'm receiving chunks of UART data, without flow control, at 115200bps. Sometimes (its quite frequent now... sometimes after 10 chunks, sometimes after 100 chunks), im getting ERRORSRC 1 on APP_ERROR_HANDLER(p_event->data.error_communication); line.

My board doesn't include a 32kHz oscillator, and Im using NRF_CLOCK_LFCLKSRC_RC_250_PPM_250MS_CALIBRATION as my clock source (I don't care about current consumption). I'm also using SDK 8 with SoftDevice 8.0.0.

What would cause this? Any idea how to solve it?

edit Edited title so it makes more clear. Thanks @RK

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