https://devzone.nordicsemi.com/f/nordic-q-a/127102/nrf9160-goes-offline-and-never-comes-back-onlineHi We currently have products in field test that disconnects from network and never reconnects. It only occurs to a few devices and not all. Restarting the device works. Devices are below a m anhole cover so RSSI is not the best but not to bad eitheren-USTelligent Community 13Tue, 24 Mar 2026 11:27:23 GMThttps://devzone.nordicsemi.com/thread/563941?ContentTypeID=1Tue, 24 Mar 2026 11:27:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:708e9d90-7567-4322-8a35-15376f7a0ff2Hakon<p>Modem team;</p> <p><span>I think without modem logs there’s not much concrete input we can give to this issue and it is just speculative what goes wrong. Also it is beneficial to update the modem to mfw1.3.7 and see if that fix anything.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/563937?ContentTypeID=1Tue, 24 Mar 2026 10:14:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:368bd6b6-600f-44b3-8e6a-001ea5524ec2Christoffer Brask<p>This is seen in Denmark on the cellular provider Telenor, which also operates in Norway right?</p> <p>The system is configured to dual system mode.</p> <p>So based on the given information you cannot provide any suggestions on how to fix/mitigate this issue?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/563926?ContentTypeID=1Tue, 24 Mar 2026 08:28:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ecbde4ea-29de-41d8-8adb-97945b6a30baHakon<p>This is what the modem team had to say;</p> <p><span></span></p> <ul> <li> <p>I think there is not much that can be said from the device side before modem logs or even AT commands are available for study. Can the customer provide modem logs?</p> </li> <li> <p>Is this seen in Denmark? What is their cellular provider / <span style="border-bottom-style:solid;border-width:2px;">MNO</span>? We have had some old network issues in Norway. <span><span><span><span></span></span><span></span></span></span></p> </li> <li> <p>Are devices configured for dual system mode, i.e., does the modem handle the system mode change or does the application handle it?</p> </li> <li> <p>If dual system mode is used, the modem will try a TAU update first in the new system, and that is usually rejected by the network. That should initiate a new attach procedure.</p> </li> </ul><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/563852?ContentTypeID=1Mon, 23 Mar 2026 11:55:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:edaab0be-27cd-4c5f-ac2f-802774e2f447Hakon<p>Yes. Sorry for delayed reply, but I have asked the modem team to have a look at this. Usually they need the full log (.bin or .mtrace format) to determine the cause, but maybe pcap file will be sufficient.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/562390?ContentTypeID=1Tue, 03 Mar 2026 08:47:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2709efa6-43ac-40e7-b22e-5c25eb9b90baChristoffer Brask<p>Anyone at Nordic which will look on this?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/561789?ContentTypeID=1Mon, 23 Feb 2026 08:25:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6eda55b0-9ef5-476e-8e71-fef139c2d9a3Christoffer Brask<p>Sadly, I don&#39;t have anymore to share. Since we cannot reproduce the error in controlled environment, I cannot make a trace of modem.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/561788?ContentTypeID=1Mon, 23 Feb 2026 08:21:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9f3861e8-602f-4fce-960b-0acf04f0340cHakon<p>Hello,</p> <p>please send the raw trace file also. It should be .bin or .mtrace.</p><div style="clear:both;"></div>