If you have many multiple Editor windows open, and in each also use many tabs, Toad will eventually crash when the GDI handles reaches 10k in Windows 10. After restarting Toad, you are presented with an option to restore the open windows as individual entries, but each entry is restored to a separate Editor window - and Toad will again freeze/crash on restoring them, as each editor windows uses approximately 410 GDI handles, while a new Editor tab uses only 28 GDI handles.
The default behaviour is that Toad will restore all entries to separate tabs in one Editor window, which prevents the issue where Toad could crash upon restart, when restoring windows.
If you start Toad with default user settings, or also test in the latest beta version with default user settings, the issue does not occur.