I have the same problems. When i am in the Blueprint or Material Editor i have sometimes crashes. At first i thought it was a problem with my graphics card AMD RX 590 and some infamous Wattsman problems. (Ryzen 5 2600X 6 Cores, 32 GB , Win 10 Pro). Then i suspected some other culprits: Windows Defender or Antivirus, Autosave im Editor but i have no clue.
The crash happens not every time but is Unreal Editor specific.