Hi Jerry,
This problem cannot be reproduced under normal working and testing conditions, on any of our working machines, on any platform.
Today we have conducted a heavy test of PixInsight 1.8.6 on Windows 10 Pro, without any issue. The test has lasted more than 2 hours on the same running instance of the PixInsight core application, and has included interactive work with huge images (some of them occupying 10 GB of RAM) and very long image preprocessing tasks with monochrome CCD and color DSLR raw images, besides many successive executions of the benchmark script. We have stressed the application heavily with many big project load/unload operations. As I have said, zero issues.
The machine where we have made this test is an Apple MacBook Pro 2018 with a 2.9 GHz Intel Core i9 processor, 32 GB of RAM, and a 2 TB SSD hard drive. Windows 10 Pro is running on a Bootcamp partition of 196 GB. The graphics card is an AMD Radeon Pro 560 X with 4 GB of VRAM (the machine also has an integrated Intel HD graphics card, but we have configured Windows to use the AMD card). You can see benchmarks
here and
here.
We have a machine very similar to yours (a Dell laptop workstation with a Xeon processor and a 4K touch screen). PixInsight 1.8.6 also runs fine on this machine on Windows 10 Pro, but we have had to update the graphics drivers (Intel HD graphics) manually to the latest version.
Have you the latest version of your graphics drivers installed?