Church Sunday School and Worship service streaming freezes and drops during active video session

Our internet source is Comcast Cable

We us a Apple laptop to record and stream regular worship service where there is only on speaker at a time.  The stream freezes, skips, stops, and sometimes totally drops during recording.  We also implement Zoom during Sunday School, Bible Study and meetings where both the facilitator and students speak.  Does anyone know of a reason this may be happening?  I am suggesting moving from cable internet source to fiber optics; however, I believe there may be zoom settings that may help short term.  Are there any other suggestions for zoom settings.  There is usually 25 to 35 Sunday School students.