windows 10 pro 1903 version.

There were some bugs in the 19xx versions of Windows 10 that could cause these issues in Opera and other Chromium-based browsers, especially when restarting Windows. That's all fixed now in 20H2 and newer. I would definitely update Windows to the newest. There's also a new, big update coming this month.

Did you recently update from Opera 75.0.3969.243 to 76.0.4017.94? You can goto the URL opera://about, take note of the "install" path and then look in that folder to see the last version you had.
I have 75.0.3969.243 now.

If so, I wonder if this happens to you specifically when Opera updates from one major version to another (75 to 76 for example) and not a month.
In this month I have 2 sign out.

Also, in opera://about, is the "profile" path what it's supposed to be? For example, it should be "C:\Users\yourusername\AppData\Roaming\Opera Software\Opera Stable".

C:\Users\user\AppData\Roaming\Opera Software\Opera Stable

Do you use Opera Sync? If so, what items do you have it set to sync?

I use Opera Sync. Problem is that when crash happens - Opera sync too crashes too. And I should to login in sync and then login in every site that I use for work.

What version of Windows are you on?

windows 10 pro 1903 version.

"Is there anything special about your Opera installation? Did you download and install Opera portable from opera.com? Or, did you install a portable version from https://portableapps.com/ for example? What's it say for the "install" path in opera://about? "

Is your user account on Windows an administrator or normal user account? Are you logged in with a Microsoft account?

admin account

Did you recently change your user account password on Windows?

not recently, half a year ago

Do you have Ccleaner installed?

no, only glary's itilities.
You think that programm can make this crashes?
Go to check it, thanks.

Every month

Did you recently update from Opera 75.0.3969.243 to 76.0.4017.94? You can goto the URL opera://about, take note of the "install" path and then look in that folder to see the last version you had.

If so, I wonder if this happens to you specifically when Opera updates from one major version to another (75 to 76 for example) and not a month.

Also, in opera://about, is the "profile" path what it's supposed to be? For example, it should be "C:\Users\yourusername\AppData\Roaming\Opera Software\Opera Stable".

Do you use Opera Sync? If so, what items do you have it set to sync?

What version of Windows are you on? Is there anything special about your Opera installation? Did you download and install Opera portable from opera.com? Or, did you install a portable version from https://portableapps.com/ for example? What's it say for the "install" path in opera://about?

Is your user account on Windows an administrator or normal user account? Are you logged in with a Microsoft account?

Did you recently change your user account password on Windows?

Do you have Ccleaner installed?