https://devzone.nordicsemi.com/f/nordic-q-a/14969/nrf52-reboots-after-ble-advertising-completesHi, I&#39;m developing something with NFC / BLE handover - it is currently working fine, NFC tag is read by a phone, nrf52 starts advertising and phone then connects to it over BLE. I just noticed though that if the advertising times out normally withen-USTelligent Community 13Wed, 06 Jul 2016 00:09:29 GMThttps://devzone.nordicsemi.com/thread/57122?ContentTypeID=1Wed, 06 Jul 2016 00:09:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c001dcc2-3cd0-402f-9916-14500426d6e4chancanasta<p>Ok - after tracing it through a bit more, slow advertising mode wasn&#39;t enabled, the handler set the current advertising mode to IDLE - then called the custom handler which put the board into sleep mode which called sleep_mode_enter which had sd_power_system_off(); in it Thanks for the responses - much apprecited</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/57120?ContentTypeID=1Tue, 05 Jul 2016 17:21:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c559313c-8c46-48d3-a6ee-6667d9546955Locky<p>Can you post the code for BLE event handling, as well as where you start advertising?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/57119?ContentTypeID=1Tue, 05 Jul 2016 16:55:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0ca3bff3-8b16-4054-93fc-23c6abddf486chancanasta<p>Hi, thanks for that - but on timeout it just tries to move to slow advertising - also it reboots on a ble disconnect - I suspect something isn&#39;t initialised correctly, but for the life of me can&#39;t find what it is</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/57121?ContentTypeID=1Tue, 05 Jul 2016 16:49:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a7596f7b-201c-4f19-89c1-00922d16a37dLocky<p>Look at the BLE event handler function. Here there should be a handler for Advertising Timeout events. I suspect that you should either see a call to reset or system_off.</p><div style="clear:both;"></div>