Let's try to generate some data to back up your experience.
So, let's test the quality of your internet connection with a long test. Run the following. https://speed.cloudflare.com/ it'll graph the speed and quality of the connection of the internet and wait till it settles. ( Wi-Fi is going to inconsistent compared to a wired Ethernet connection.)
Once the connection looks reasonably stable, then try calling and seeing if the graph changes significantly! Obviously, you can rerun it multiple times to experiment.
So, let's test the quality of your internet connection with a long test. Run the following. https://speed.cloudflare.com/ it'll graph the speed and quality of the connection of the internet and wait till it settles. ( Wi-Fi is going to inconsistent compared to a wired Ethernet connection.)
Once the connection looks reasonably stable, then try calling and seeing if the graph changes significantly! Obviously, you can rerun it multiple times to experiment.