FREDIK BORLIE IS A GENIUS! Below is a cut/paste of his post above - PRESSING DOWN IN THE SPACE BETWEEN THE SPACE BAR & THE TRACK PAD it is the ONLY thing that worked on my 2015 MacPro so I could go in and disable bluetooth, which hopefully will keep this from happening again until I can make the $12 repair mentioned in the YouTube video:
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'''POSTED: MARCH 11'''
'''OPTIONS'''
for me the issue is a glitchy connector for the trackpad cable.
Sometimes it works when I press down the frame between the trackpad and spacebar. Just now when I followed this guide
https://www.youtube.com/watch?v=FzcBL1NB...
I realize that the reason it works is because the connector is pressed into the socket. But then it stops again after a while. So today I removed the connector shield and added extra padding to see if that stops the connector to stop dropping out of the socket.