No CTD in a week of flying!
It was CTD HELL two weeks ago.
I did these things by experimentation. I am NOT saying any of it will fix you.
First, I shut down overclocking.
Second, went to my monitor manufacturer and downloaded/installed their specific driver for my monitor. Not looking to let W10 choose.
Third, after noting MSFS settings showed a resolution that did not match the native res for my monitor, reset Full Screen Resolution. Also, Render Scaling slider set to 100 matching Rendering Resolution to Full screen number. V-Sync to off.
Fourth, starting Global Rendering Quality at Low End moved up a step at a time. Flying the same short flight at each step. After reaching high end setting I setting I changed individual settings to what looked best to me.
NO CTDs in 7 days of intense flying using lots of Community folder stuff and nearly every default and every payware/freeware aircraft I have.
It was 2 days of testing.
I am amazed at how beautifully MSFS is working for me now.
Best wishes to you all. Jim