Okay.
Suggestion:
Could you try changing your router security from WPA to WPA2, or vice-versa.
Question:
Do you use a static public IP address (a permanent, fixed address)?
Your service provider can assign a static address. If you don’t know about it, you probably don’t have one.
Just like not being aware that you have a Maserati.
How is your back-haul configured on the Orbi? Mesh or Star?