@DoctorSyzygy I'm sorry to hear that this is (at least partly) a hardware issue, but at least you have an answer. Good luck with the rest of the process.
There was no Memory.dmp, but I found some GameManagerService3exe dump files in C:\Windows\SysWOW64\config\systemprofile\AppData\Local\CrashDumps from Dec 1 (when the Sims was crashing). Not sure if it will help, but it's at: https://u.pcloud.link/publink/show?code=XZuKYsVZxleljrorfrp5QodRcQzFU5Y51dx7
Talked to Dell. They had me run a bunch of hardware checks and said that since there aren't any hardware errors and that the computer actually runs, it must be a Sims or LibreOffice compatibility problem with Windows 11. I pointed out that presumably hundreds of thousands of people are running those programs with Windows 11; the tech didn't have a response to that. The tech suggested that I reinstall Windows back to Win 10 and see if the programs work there. I'm going to hold off on that for now.
Community Manager
