A strange bug has appeared in Windows 11: computers are restarting automatically, and Microsoft has released an emergency update..

Microsoft's first Windows 11 security update of 2026 has caused problems for some users. After installing this update, some computers are unable to shut down or hibernate properly. In many cases, the system restarts instead of shutting down, leading users to believe that the shutdown feature is broken.

According to reports, this problem emerged after the Windows 11 update released on January 13, 2026, which is identified as KB5073455 in many places. After the update, when a user tries to shut down, restart, or hibernate their PC, the system reboots instead of entering the selected power state.

Which users are affected?
This bug is not affecting all Windows 11 users. According to the information available, this problem has primarily been observed in systems running Windows 11 Enterprise and IoT editions. Devices with the System Guard Secure Launch feature enabled are particularly affected.

Secure Launch is a security feature used to protect the boot process from firmware-level threats. This is why the issue is typically seen in managed or highly secure corporate systems.

What Microsoft said
Microsoft has officially acknowledged the problem. The company stated on its Windows Release Health page that this glitch appeared in some systems after the January security update. According to media reports, Microsoft also released an out-of-band, or emergency, update on January 17, 2026, to fix this shutdown bug. This emergency patch also addressed some other issues related to remote access applications that surfaced during the same update cycle.

What users can do in the meantime?
Until the fix is ​​fully rolled out to all affected systems, Microsoft has provided a temporary workaround. Users can perform a forced shutdown using the Command Prompt. However, the company has advised users to save all their work before forcing a shutdown, as this method may cause apps to close abruptly instead of shutting down normally.

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