Video-conferencing is crashing my Mac (Teams, Zoom, Skype, etc.)

Ok, here´s an update that might help some others who have/had a similar problem: after getting in touch with some Apple Advisors and going through all the standard procedures to find the solution I got in contact with a very friendly and smart guy there and we tested some things out. Finally, after we had come to the result that my machine had to be send to an Apple Center for further investigation, he asked me one last question: did you upgrade your RAM? And I said "Yes". He then asked me if the RAM sizes were now different... and I answered "Yes: 2x4 -the stock RAM- and 2x16 - the RAM I had upgraded".

Well... voila... that had been the problem! I took out the 8GB RAM (the 2x4 stock that came with the machine) and left only the 2x16GB which I had upgraded by myself... and: problem gone! No more freezing, no more crashes and the Mac even seems to be faster than before. I have tested all the video-conferencing apps that usually would make the Mac crash... and put them under heavy load... and the Mac runs just like a good oiled machine.

So, my tip: IF you have upgraded your Mac with RAM sticks that do not match the original sizes... try to take them out and check who it works. I have the feeling that Catalina is a bit more sensitive regarding RAM than Sierra or High Sierra were.

At least this solution worked for me and I consider my case closed.

Thank you! So... you don't think it's a software prob? It worked perfectly until the MacOS was updated, never had problem before. On the other side, if I am the only one who has problems with it... then the chance is big, that it is a prob on my machine :-(

That would be a possible evidence that it's not the GPU which is faulty, but something else on the software side... which is what I actually think. I wonder if more people will chime in with the same prob!