Why did my device fail to register to the NB network suddenly ?

[duxinglang]

I used Nrf9160 to develop a product. Until yesterday, I had been able to connect to the nb network normally. But today, I found that my device could no longer register to the network. When I queried the modem status through the log, it returned the following information:

+CEREG: 5,0,"1D29","033E8D87",9,0,0,"11100000","11100000"

My problem is that since TAC and cell ID can be received, it means that the antenna can receive signals, and I also query the status of the sim card, and it is normal. What causes this problem?

[Hakon]

Hello,

do you have any logs from this? It looks like the modem isn't trying to scan. What are you doing in the application to connect? Can you show conf files, and also the part of the code where you are initializing the modem?

[duxinglang]

Hi! Thank you for your reply.

The problem is found. The timeout time I set for network registration is too short. It was originally reserved for 1 minute, but now it can be registered to the network by changing it to 3 minutes, although it actually only takes about 1 minute and 19 seconds.