GPU Crashed or D3D Device Removed crashes

Suddenly getting a lot of generic GPU Crashed or D3D Device Removed crashes when opening a project. In Unreal 5.1.1 Caustics branch.
I think must be Direct X12 related because I get a 2nd error pop-up referencing D3D12RHI

D3DUtil.cpp {Line: 868} → GetTimestampFrequency failed
at
…D3D12Device.cpp:691
with error DXGI_ERROR_DEVICE_REMOVED

Anyone else experience this and how did you resolve?
GPU_Crashed_or_D3D Device Removed