Broadband keeps dropping when on FaceTime

[Pawstretchers]

When on FaceTime or Skype the internet drops and we can't see or hear the other person, but they can see and hear us all ok. 
Sky says that everything is all ok on the line and hub

We have unplugged and plugged back in the hub, has anyone had this problem and know how to resolve it

many thanks 

[Highlinder]

@Pawstretchers Could you please post your router stats following the link below.
https://helpforum.sky.com/t5/Broadband/How-to-find-your-Sky-Broadband-router-stats/td-p/2855717#M101...