https://devzone.nordicsemi.com/f/nordic-q-a/23853/device-disconnects-randomlyHi, I&#39;m using a nrf51 custom board (IC no. N51822QFAAH0) with Softdevice S130 v2.0.0 and SDK_11. After connecting it with nrf Connect Android App, the device gets disconnected randomly ( gives Error 8 (0x8) GATT_CONN_TIMEOUT ). I tried same codeen-USTelligent Community 13Sat, 29 Jul 2017 06:03:47 GMThttps://devzone.nordicsemi.com/thread/93855?ContentTypeID=1Sat, 29 Jul 2017 06:03:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:17bf40b8-333f-4f92-9fe7-cdb75a6172bdRohanKadam<p>The code works with nRF51 DK.</p> <p>I followed your another answer <a href="https://devzone.nordicsemi.com/question/133715/ble_hci_connection_timeout-and-nrf_clock_lf_xtal_accuracy_xx_ppm/">devzone.nordicsemi.com/.../</a> and it solved frequent disconnections problem. Changing NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM to NRF_CLOCK_LF_XTAL_ACCURACY_500_PPM worked.</p> <p>Thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/93854?ContentTypeID=1Thu, 27 Jul 2017 13:28:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a042e3e9-bc31-44d3-b101-be07c29be876FormerMember<p>Do you see this problem if you run the same code on a nRF51-DK?</p> <p>If not, the problem could be related to the board, possibly poor range. What does your board look like? Could you upload schematic and layout of the RF part of the board?</p><div style="clear:both;"></div>