https://devzone.nordicsemi.com/f/nordic-q-a/124699/ntf9160-reboot-after-lte-connectWe have a nrf9160 chip on a custom board with zephyr as the operation system. Modem firmware is 1.3.7. The board is battery powered, but can for development purposes also be power externally. The device sporadically show the following issue, both withen-USTelligent Community 13Tue, 30 Sep 2025 09:46:01 GMThttps://devzone.nordicsemi.com/thread/550121?ContentTypeID=1Tue, 30 Sep 2025 09:46:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:04c8d358-974f-4c03-bc02-713759555132Torsten Rupp<p>I cannot reproduce this issue. Unfortunately it seems it happen randomly. I try to read out the reset cause when the issue become visible again.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/550118?ContentTypeID=1Tue, 30 Sep 2025 09:33:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:102676ed-3c9b-4e23-98ba-38d883e11bc3Achim Kraus<p>It&#39;s possible to&nbsp;<a href="https://github.com/boaks/zephyr-coaps-client/blob/main/src/appl_diagnose.c#L181-L264">read the reset cause</a>&nbsp;, so I would start with that. If no flag is set (read cause is 0), then on a nRF91 it&#39;s a POR.&nbsp;</p><div style="clear:both;"></div>