Same here in France. It's not the first time in history of Opera. I have been using this browser since 2008 and around 2015 every year I have the same problem several times a year.
I found a tip to avoid the freeze withou losting the tabs and the sessions, just the Fast access pages on a new tab.
Go to your Windows Explorer and search :
C:\Users\THE NAME OF YOUR PC HERE\AppData\Roaming\Opera Software\Opera Stable
And you delete the files "Preferences" and "Preferences.backup"