Hello, I came across your comments @TheGribble which are helpful. We have had similar problems with XBee3 radios resetting themselves to factory defaults. If you are still monitoring this thread, would you comment further on the test you did? I take it that during your test you were able to get the problem to repeat some number of times by power cycling the radio module every 10 minutes for 3 weeks. Is that correct? If a power cycle is what causes the issue that would be helpful to confirm. Maybe there is a problem with the XBee3 microcontroller supervisor circuits that on rare occasion a power transition will run code resetting the radio non-volatile or something related. In another forum posts the tech support response was to not run the XBee3 below VMIN, but voltage must pass below VMIN at some point when powering on and off.
FYI: Our experience has been this problem is rare, but consistent enough to be a problem. For us we only noticed this as a problem with the XBee3 radios (802.15.4), not the older S1 or S2C. Also of note, in my search I found four other forum posts of similar issues with the XBee3 radios: