Hi George,
Since reinstalling Roblox did not help, the next step is to check whether the crash is being triggered by the graphics/display path, especially since it can occur when Alt-Tabbing.
Please try these checks:
- Temporarily cap Roblox at 60 FPS and test again. This helps determine whether the crash is related to the current 144 Hz/FPS configuration.
- Disable overlays/background hooks temporarily, such as NVIDIA/GeForce Experience, Discord, Xbox Game Bar, MSI Afterburner, or similar apps, then test Roblox.
- After the next crash, open Reliability Monitor (perfmon /rel) and select the Roblox failure. Check the Faulting application/module details.
If possible, share the Roblox failure details shown in Reliability Monitor. That should give us a more useful direction than repeating the reinstall.
Hope this helps narrow down what is triggering the crashes.