what causes a AIRCR.SYSRESETREQ reset

[Timothy]

We have a working production system that is based on asset_trackerV2. It is working perfectly but there is a random event happening that I can not explain. On every reset I print out the cause of the reset based on the information in the nRF9160 data sheet for resetcause register. We have hundreds of boards out in the field and it seems that occasionally (one or twice a 24 hour period) I get a reset with a cause AIRCR.SYSRESETREQ. There is no commands or activity that should have caused this reset. It is a matter of concern to customers because we do not understand why the board is randomly getting reset. How do I determine what caused this reset. I see AIRCR.SYSRESETREQ if I flash the board from Visual Studio or I  issue a software reset but no one is doing either of these in the middle of the night. I would appreciate any guidance you can give on finding the cause of this reset.

[Charlie]

Hi,

Thanks for checking with us.

Assuming I have zero knowledge about your product, could you provide a brief introduction to your setup? Specifically:

1. Hardware Setup: Are you using a custom board or the original nRF DK? if this is a custom board, have you request any hw review before? share the ticket link if you have.
2. Software Versions: Which versions of NCS and MFW are you using? are you using unmofied assert_trackerv2? what is your builiding configuration?

Additionally:

• Can you reproduce this issue on the original DK boards?
• Could you try collecting and sharing logs and a modem trace from the device exhibiting the issue?

This information will help us better understand the problem and assist you further.

Best regards,

Charlie