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First I'd establish if it's the home network or Xfinity. I would connect my laptop via Ethernet to the Xfinity modem and test speed there.
Then I'd disable the Orbi thing and turn on the WiFi on the Xfinity modem and test speed there.
Then I'd turn on the 1 Orbi thing that connects to the modem, and if the Orbi thing has an Ethernet port, I'd test that first.
Then WiFi via the Orbi... and add each access point one by one.
If at any point there's a problem I'd probably do a hardware reset on that device.
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