Hi

I have a TP-Link Archer VR2600 Router that seems to work fine, I have no issues with speed or connection most of the time.

Speed tests show ~65mb down and ~18mb up on both wired and wireless connections.

My wife uses Facetime on an iPhone 7 to chat with her Mother in Holland and both of our kids who are away at University. If she connects to the Wi-Fi to use Facetime and make these calls, to three different people, in three different locations, then she constantly gets "Poor Connection" messages and no video. 

If she switches off Wi-Fi and uses 3G - There are no issues...it works fine...

I have reset the router to factory settings and set the DNS to Google DNS 8.8.8.8 and 8.8.4.4 to see if this would make any difference but the issue still remains.

Does anyone have any ideas on what could be causing this issue? 

I'm not sure if the issues is with the Router and something needs to be changed or if it is something on the Plusnet (My ISP) Network?

Thanks
Michael