Bluetooth coexistence is wonky right now, which means things don’t work great when you use 2.4GHz WiFi and Bluetooth at the same time. If you can, switching to 5G WiFi should help. You can also try changing the Bluetooth codec selection in pavucontrol, as some codecs use more bandwidth than others and are less reliable.
Note that some interaction between 2.4G WiFi and Bluetooth is inevitable, since they are literally using the same antennas and the same spectrum. But right now it’s worse than it should be. It is normal for Bluetooth audio streaming to noticeably reduce 2.4GHz WiFi performance (you’ll see this on macOS too), but the drop-outs and issues we have now are because something about coexistence isn’t set up properly yet (so it’s not prioritizing Bluetooth like it should).