I have been experiencing very frustrating in-game crashes on my Rift S. Games like Vader Immortal, Discovering Space 2 and Superhot VR will crash randomly after a few minutes. The in-game picture freezes and then the Rift S goes black. The game on the PC is also showing as totally frozen. Its as if the headset cameras stop working. I have to unplug it and go from there to get it back working.
Games that work seamlessly with no crashes are Beat Sabre and Star Wars: Squadrons (in the case of Star Wars, that's via Steam).
My set up is... Intel Core i7-9700K 3.6GHz Team Group Vulcan Z T-Force 32GB Samsung 970 EVO Plus 1TB M.2 2280 PCI-e 3.0 x4 NVMe Solid State Drive MSI GeForce RTX 2080 Super Ventus XS OC 8192MB GDDR6 PCI-Express Graphics Card Microsoft Windows 10 Home Advanced
I have updated Windows and GPU drivers. I have followed instructions from a number of different sources, including completely reinstalling the Rift S. We are in a cool room and have plenty of space.
Are all those games played through Steam or also Oculus Store? Seems more people have crashes when playing through Oculus itself. Your setup seems more than capable of running everything on Ultra so I don't think the problem is performance wise.
If you have any of your PC components overclocked, I'd turn those back to base clock-speeds and try playing the games again. I've heard that overclocking your PC can lead to issues with the Rift-S in more ways then one
If you don't have your PC overclocked, then I would honestly contact Oculus Support. I know it's not ideal, but more often then not they know something that we don't, and can find a solution more quickly for you. And worst case scenario they don't have a solution, then hopefully they'll tip the Oculus Devs about it and they will push out a patch for it.