Orbi RBR50 directly connected to internet modem reduces performance

Thanks for the quick response.  Firmware version - V2.2.1.210, which I think is the latest.  I reluctantly did what you suggested and the results are the same.  I say reluctantly because although it's been many years since I've had to deal with networking regularly, I cringe when I hear "reset to factory defaults", or turn off "X" or "Y".  In my experience, it's means I'm trying to compensate for a deficiency in the product.  

So I returned to the provider's router and the speeds are consistently 900Mbps+ while the Orbi was consistently 400Mbps-.  I even switched the Orbi to AP mode with the same throughput.  It appears to me, and I could be missing something, that the Orbi, although wonderful at mesh networking is not ready for primetime when it comes to accomodating the higher bandwidth.  I was on a 300Mbps plan until I upgraded last Friday.  That's when the Orbi fell down.

Thanks for the guidance and assistance.