facetime failed and BT smart hub dual bands wifi problem

I have just fixed the ipad / iphone Facetime Failed problem, last 7 days, the ipad / iphone facetime video call always drop, dropped in 20 seconds after the video call. make or receive FaceTime calls, the call lasts about 20-30 seconds,
I managed to find the real reason: the BT smart hub has dual bands wireless, 2.4GHz and 5Ghz, I have to turn the 5Ghz off, then the facetime back to working.

You can find the details in the video below:

Facetime failed? check if your router or wifi extender has dual band function, 2.4Ghz and 5Ghz, turn off 5Ghz band, done. facetime failed problem fixed.

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