My Orbi RBR10 seems to reboot at 10:59 EST every day. How do I stop that?

There is no know feature or issue that would cause your Orbi to reboot at the same time each day, so therefore it's difficult for us to tell you how to stop it.  Can you eliminate any environmental issues, e.g., how is the Orbi plugged in (i.e., is it plugged directly into the wall or through a power strip or switch)?

How can you tell that the RBR10 is power cycling, e.g., if you go to http://orbilogin.com/debug.htm do you see that System Uptime is resetting each day?  Do you have any Orbi satellites with your system and are they power-cycling too (you can visit http://IP_ADDRESS/debug.htm and see the satellite uptime, where IP_ADDRESS is the satellite's IP address from http://orbilogin.com ... Attached Devices)?