@Solla-topee Hi, thanks for responding.  I can't be definitive about some of the answers here as unfortunately the last two times this has happened I've been away from home and another family member has reset the unit.

1. When the Deco crashes, what's the LED status on the main Deco and the satellite Deco, such as solid red, flashing red, etc.?

All units show solid red I think.  

  2. How do you restore the network connection after crashes, such as rebooting the Deco nodes?

Restarting the main unit only restores network connection for all other units - i.e. I don't need to restart the satellite nodes

  3. When the reported phenomenon occurs, is the satellite Deco disconnected from the main Deco? If so, how do you test that?

This is difficult to diagnose; mostly because once devices are unable to find the internet via WiFi they "pretend" that wifi is down and revert to things like 5g or simply show that they can't connect.  I *think* that if I was on a PC I would be able to ping / tracert to the satellite nodes via their IP addresses, but can't be sure.  But as posted above, physically restarting the main unit solves the issue.  

  4. If rebooting the Deco nodes will restore the network connection, but you do not want to schedule a daily reboot, you may go to the Deco app > More > System > Reboot Schedule to enable the weekly reboot schedule if you can see the option, and check if it helps.

Agree that this is feasible, however a weekly reboot is a clunky workaround to something else being an issue, and it doesn't resolve the fact that a crash may happen outside of that window.  Of course, it could be that 3-4 weeks of constant use builds up some sort of memory leak or similar, but I've not got any info to say that that is the issue or not.  And if that is the issue, I would like to be able to pinpoint it in any event so that a solution could be found.