https://devzone.nordicsemi.com/f/nordic-q-a/12663/nrf-uart-v2-0-app-disconnects-particular-data-rateHi all, I am using ble_app_uart application to send data to a Bluetooth device. I am sending the data to the Tx Rx Pins of nrF51822 module via an external controller. My baud rate is set to 31250 and I am sending 3 bytes of data to the nrf51822 fromen-USTelligent Community 13Tue, 22 Mar 2016 13:09:02 GMThttps://devzone.nordicsemi.com/thread/48117?ContentTypeID=1Tue, 22 Mar 2016 13:09:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c4a9b6d4-f8ed-47e6-9de8-4383f563c2e0MartinBL<p>Your own suggestion sounds very likely. How many bytes are you sending from the controller every 3 ms? I guess you get some overflow and then end up in some error handler somewhere. Have you tried to debug your code? <a href="https://devzone.nordicsemi.com/question/60125/my-device-is-freezing-and-restarting/?answer=60126#post-id-60126">Check for error asserts</a> and maybe put a breakpoint inside the UART event handler to check for any UART errors. Are you able to provide a logic trace of the UART lines? Then we could clearly see how strained the UADT lines actually are.</p><div style="clear:both;"></div>