I am running Premiere Elements 2021.1 (Version 19.0, 20210127.daily.2235820) on Windows 10 Pro 20H2, build 19042.804). After using it for less than 1/2 hour, the memory usage maxes out (16GB) and the SSD usage goes to 100%. The screen goes black and comes back, but no longer using the nVidia GTX970 GPU, but rather the Intel integrated HD Graphics 3000 on the i7 2600k.
I have disabled the Intel graphics device in the task manager, but the problem persists. The nVidia GPU is using driver 461.72.
Since I have only been using this a day on this particular machine, I cannot say what all triggers this, but so far it was a file save requester and narration. Any suggestions for how to fix this?