I noticed that after a while (a few days), the wifi starts to drop and slow down, until a point where you can't access the board anymore.
I managed to log onto the board before the wifi completely drops, and I can see a lot of the following when I run
[85447.067014] [ca8210] data confirm timed out
These messages are appearing massively only after around 80000 sec of runtime (at least this time).
Also, it looks like the 6lowpan isn't working anymore, but I don't know if it's related or not.
Any idea how I could investigate what is happening on the wifi side, and on the 6lowpan side ? I have my ci40 running 24 hours a day, 7 days a week these days, so I can run long terms investigations easily.