Hello Alberto,
This kind of issue often stems from problems with your Outlook profile, corrupted data files, or outdated server settings, and it can feel overwhelming when you’re not sure where to start. You’re not alone in this, You can try repairing your Outlook data file using the Inbox Repair Tool (scanpst.exe), or create a new Outlook profile through the Control Panel to reset your configuration.
Sometimes, disabling problematic add-ins or launching Outlook in Safe Mode can reveal what’s causing the issue. It’s also worth double-checking your email account settings to make sure the server details are correct, and updating Outlook and Windows to the latest version.
This might help