Fibre 150 - unstable connection

[IndieS1]

We've recently upgraded to Fibre 150, and we have the usual devices connected (tablets, phones, work laptops). The Sky router is placed around 20 feet away from my work station at home, yet when I'm on a Zoom call I get the "unstable connection" message on my laptop and my Zoom connection breaks up. I do tests and it says I have around 90mbps on the WIFI and 150mbps directly to the router. What could be causing this poor service? Thanks