My collegue had same issue when using AMD Ryzen. So I think that this resolves the problem. Apparently in some cases CPU is stressed so hard, that sometimes it can't handle well any other tasks like rendering your desktop, and cursor movements. AIDA64 doesn't have that kind of impact. My OC was tested with it for 24 hours and no single error. Same with 8 hours of RealBench. I used Blender too and it handles well.