Zoom Lagging

Hi

I have a zoom pro plan and it is getting untenable.  The picture lags and freezes and is just awful.

I have checked my internet upload and download speeds and they are fine.  I have loads of space on my computer.  It is frustrating me that I don't know what is causing this, and I am paying for a service that is rubbish.  I am now looking for an alternative as I don't want to upgrade my zoom package and it still be c*ap.  

Has anyone else had the same problem?  If so did you fix it or leave?