nRF9160 intermittent LTE-M connection loss, strange modem traces

RE: nRF9160 intermittent LTE-M connection loss, strange modem traces

Stephan Walter — Mon, 21 Sep 2026 14:59:12 GMT

Thank you Øyvind for escalating this.

In the meantime I have upgraded the modem firmware of one of the affected devices to 1.3.7. So far I have not seen the issue appear again. It would be great if your team could confirm that this was indeed an issue that was found and fixed. We could then be confident that a modem firmware upgrade in the field would solve the problem.

RE: nRF9160 intermittent LTE-M connection loss, strange modem traces

Øyvind — Thu, 17 Sep 2026 13:44:40 GMT

Hi Stephan,

Thanks for providing the .zip file. I was able to open these but not able to see the root cause. I will forward internally to our team.

Kind regards,
Øyvind

RE: nRF9160 intermittent LTE-M connection loss, strange modem traces

Stephan Walter — Thu, 17 Sep 2026 11:48:07 GMT

Hi Øyvind,

Thanks for the quick response. It looks like the *.bin files got corrupted when I created or edited the post. I'll attach all the files as a zip archive.

devzone.nordicsemi.com/.../1537.trace.zip

We are using version 2.8.0 of the nRF Connect SDK.

Best regards,
--Stephan Walter

RE: nRF9160 intermittent LTE-M connection loss, strange modem traces

Øyvind — Thu, 17 Sep 2026 11:38:14 GMT

Hello,

Thanks for providing the attachments. Unfortunately the modem traces, i.e. .bin files, do not have have any usable data. I am not able to open in Wireshark from the Cellular Monitor. Can you please retry?

Looking at the trace log, e.g. trace1.log I see the following issue multiple times: srv_lte: getaddrinfo error: EAI_SYSTEM errno=116 indicating there was a DNS issue where the query timed out.

What version of the nRF Connect SDK are you developing in?

Kind regards,
Øyvind