SXR80 - Network drops on Voice/Video (zoom etc)

Hi all,

hping you can help as I have a odd isue that is driving me mad - I don't even know for sure it's the router. 

I've been having periodic freezes on my zoom calls, Teams calls etc. could be every 60 seconds or every few minutes. 

I've been monitoring throuput traffc and I'm seeing drop off on recieving traffic. 

I also tested on my mobile connected to the network and see similar.

On my pc this is ethernet connected. 

sorry this is vague - networks aren't my strongest area. Any ideas please? 

thanks