Photoshop: Occasionally freezes/crashes on Undo

Hi,
I have the problem that Photoshop hangs infinitely sometimes after using undo (the new undo). There is no error, it just freezes and I have to shut it down over task manager.

I am using Photoshop CC 20.0.5, but tried also 19.1.8 and had there the same problem.

I am using Windows 10, have the latest Nvidia driver (431.36).

Also using a Wacom graphic tablet with the latest driver.

I already reset the preferences but with no success.

Don't know what I can do anymore to make it work. Kind of impossible to work with this problem.