Hi Thomas Neville,
Since the sign-in frequency appears to have changed recently without your involvement, it may be worth checking whether a recent update or third-party security/optimization utility has modified your lock screen or inactivity settings.
In addition to AI answer, you can try the following checks:
- Press Win + R, type
control.exe /name Microsoft.PowerOptionsand press Enter. - Select Choose what closing the lid does and review any power or sleep-related settings that may be triggering the lock screen sooner than expected.
- If you use any security, privacy, or PC optimization software, temporarily disable it and observe whether the behavior changes.
If the issue started only recently, you may also want to check Settings > Windows Update > Update history to see whether the timing coincides with a recent system update.
Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.