Dear Steph McLean,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I'm sorry to hear that you're experiencing issues with Microsoft Teams. Based on the information you've provided; it seems like the issue might be related to your network connection or the settings on your computer.
Have you checked to make sure it is not due to compatibility issue?
Make sure that your internet connection is stable and that you have enough bandwidth to support Teams calls. You can try running a speed test to check your internet speed.
Make sure that your audio settings are configured correctly in Teams. You can check this by going to Settings > Devices > Audio devices.
Make sure that your audio drivers are up to date. You can check this by going to Device Manager > Sound, video and game controllers.
Clearing your Teams cache can sometimes help resolve issues. You can do this by going to Settings > Privacy > Clear cache.
If none of these steps work, please let me know and provide details like system settings so we can explore other options. Please understand that our initial response may not always resolve the issue right away. However, with your help and more detailed information, we can work together to find a solution. Thank you for your help.