After installing V16, Bld 307, Vegas would lock up every 8-10 minutes, forcing me to end it with Task Manager. Needing to get things done, I re-installed V15 B387. It seemed ok, as long as I kept saving after every change. But yesterday, trying my first serious project, the crashes continued, and continued to come at ever shorter intervals, and I needed to restart the computer after every lockup. By the end of the night, I barely got one, 7-minute render out of it (and it was rendering mostly already-rendered clips, so it went quick). The original footage was 4k, 3840x2160, 23.976fps. I rendered that to 1920x1080, 29.97 and used that in the project. I needed to render as a square,1080 x 1080 frame, which I did by making the Pan/Crop frame 1080x1080, and changing the Render Properties to 1080x1080. One other odd thing that happened is that when I would re-open after a crash, and I'd see the window asking if I wanted it t recover an auto-saved version, I found that the version of the project I'd last saved had more recent changes than the auto-saved one Vegas opened for me. I'm doing this for a Adobe Premier fan, whom I'd told how quickly Vegas could do this. He still need to get 4 more similar clips out, and I may have to bail. I don't recall Vegas failing me so disastrously since the earliest days.
Any suggestions are deeply appreciated.