A weak or unstable WiFi connection can affect the quality of the video call with your professional. You can try switching to a 4G network instead of WiFi, to improve your internet connection.

If you don't want to or are not able to, you can try to improve your WiFi connection by ensuring that there aren't any other devices such as telephones, laptops, TVs, or game consoles, also using the WiFi network while you are video calling. For example, watching Netflix or Youtube videos, playing online games, or making video calls can affect your internet connection. 

You can also try moving closer to the Wi-Fi router, or turning the router on and off. If this still doesn't help to improve the connection, try to find an alternative Wi-Fi with a good connection.