Email is stopping without any cause

eM Client, is crashing without any evident cause, since 4 days ago.
I can nod identify any evident cause or any other symptom. It only closes without any alert.

When you restart, is eMC performing a database check each time?
Have you reviewed the Operation Errors and Operation Log (MENU > Operations) to check for any indication of an error/warning at the time of the “crash”?
What version of eMC are you using?
What operating system and version are you using?
What exactly was occurring on your system at the time this initially began, “4 days ago”?

When you restart, is eMC performing a database check each time?
Yes
Have you reviewed the Operation Errors and Operation Log (MENU >
errors: no errors found.

Operations) to check for any indication of an error/warning at the time of the “crash”?
Can not identify any.
What version of eMC are you using?
9.0.1708
What operating system and version are you using?
Windows 11
What exactly was occurring on your system at the time this initially began, “4 days ago”?
Trying to read my email.

If eM Client crashes without a crash report popup, then it is most likely the Windows 11 UI Automation bug.

You can run eM Client in Windows 8 Compatibility mode which should circumvent this until Microsoft can release an update.

what is windows 11 UI Automation?

It is part of the Windows OS that is broken in Windows 11 releases.

The reason why you might notice it with eM Client is described here.