Had non stop D3D crashes with a project using 5.3.0P1 and a 4090 with latest drivers and extra regedit settings.
Using the command option ‘-gpucrashdebugging’ found a reference to ‘particles’ at the end of the log file. After removing the 3dGasIntro campfire (NiagaraFluid plugin) from the project, the non-stop crashes are gone. Crossing fingers…
See How to Fix a GPU Driver Crash When Using Unreal Engine | Unreal Engine 5.0 Documentation
Edit: in another project I also got many crashes. It seems to get solved by opening the Nvidia menu and reset it all to default settings.