Buffering pauses during meetings.

Have Zoom basic and downloaded latest update (earlier ones do the same). Have T-Mobil Home Internet through cell tower, and wireless from modem to my computer. When in Zoom meeting today with 41 participants (same happens often in other meetings with more than 3),  experienced  several breaks/pauses/buffering episodes during the first hour (12-1pm Eastern),  about 10-15 seconds long with missed dialog. During last hour of meeting, had no lapses. Did speed test when it was occurring. 30MbPS download, and 11 upload. Have worked with T-Mobile several times and they can find no problems and have no resolutions. We stream television through the same wireless connection, and have very, very few buffering lapses, mainly only during bad storms. Can you suggest any resolutions to this problem?  An aside: T-Mobile main servers are in the Detroit, Michigan area, about 300 or so miles away.