Hello
Thank you for posting in Microsoft Community forum.
I’m sorry to hear about the issues you’re experiencing with your Windows Server 2019. Here are a few suggestions that might help:
System File Checker and DISM: You can try running the System File Checker (SFC) and Deployment Image Servicing and Management (DISM) tools. These tools can help fix corruption in the system files.
Disable Secure Logon: Another option is to disable the requirement for Ctrl+Alt+Delete at the login screen. You can do this by going to Start -> Run -> netplwiz -> Advanced tab -> Under Secure logon, uncheck "Require users to press Ctrl+Alt+Delete".
Repair Mode: If the issue persists, you might need to boot into Repair Mode to perform necessary repairs or a system reset.
Event log: Check the Event View-Windows log-system to see if there are logs related to login.
Safe mode: Enter safe mode and leave it for a while to check whether similar problems occur. If it is normal, run clean boot mode. If the fault persists, consider troubleshooting hardware reasons.
Best Regards,
Wesley Li