Additional meeting and call-related features and issues within Microsoft Teams for business
Hi Andre,
maybe it is not your Surface Pro 3. I also have this problem and I have a Surface Pro 7/i5/256. I have this problem only for video calls (just audio is fine). However, I have it also with less than 10 people. Setting the energy slider to maximum performance helps a little but not much.
Your post is the only one I have found so far, which matches the issue I am experiencing.