Since hardware stress tests came back clean, this likely points to a driver conflict (especially GPU or chipset), a corrupted Windows system file, or an unstable UE5/VS toolchain. Try updating or reinstalling your GPU drivers using DDU in Safe Mode, run sfc /scannow and DISM commands to check for Windows corruption, and ensure you’re on the latest stable versions of both UE5 and Visual Studio (with required workloads installed). If the issue persists, test in a clean user profile or reinstall Windows as a last resort.