The problems you're having could be caused by poor internet, high CPU or memory usage. Start by using the Health Checker when in a meeting. It can help to check your internet connections as well as computer resources.
Take a look at other applications or services that are running at the same time as your meetings to see if you can close anything to free up memory/CPU. Possibly start with a fresh reboot before a meeting and don't open any other applications before joining a meeting. If you don't have any problems, this could indicate the problem is with an application that is taking up the computer resources.
I know many colleges have a student support center. You can contact them for help as well. If they have access to the Webex Control Hub, they can look at logs from meetings you've attended and see similar data as the health checker that might identify the cause as well. If the problem is with CPU/memory, they can help with checking your computer to identify applications and processes and develop a solution.
Good luck and hopefully this information will help you to solve the problem.
