A recent Windows 11 update has caused Task Manager to misbehave. Closing it doesn’t fully shut it down, resulting in multiple instances running simultaneously and potentially affecting system performance.
Task Manager not closing properly
Multiple instances can run simultaneously
Each instance consumes system RAM
Performance impact may go unnoticed
Frequent reopening leads to bloat
Battery life could be affected
Following the Windows 11 October 2025 optional update KB5067036, a notable bug causes the Task Manager to duplicate itself instead of closing when users click the “X” button. Microsoft has acknowledged the issue and warned of potential system performance degradation. This article provides detailed, accurate information and actionable solutions for managing the issue effectively. [1][2]
Origin and Technical Background of the Bug
The bug stems from the October 28, 2025, preview update KB5067036 for Windows 11 24H2 and 25H2 editions. This update introduced interface enhancements like a redesigned Start menu but unintentionally altered Task Manager’s close behavior. Closing Task Manager via the close button does not terminate the process but leaves it running invisibly. Reopening Task Manager spawns additional instances, resulting in multiple lingering processes consuming system resources. These symptoms have been widely documented and confirmed by Microsoft and independent testers. [3][4][1]
System Resource Impact and Performance Concerns
Each lingering Task Manager process typically uses 20 to 25 MB of RAM. [3]
Repeated openings and closings can cumulatively consume multiple gigabytes of memory, adversely affecting system performance and battery life, especially on low-RAM devices or those with long uptimes. [3]The issue only affects systems with KB5067036 installed and is not present universally on all Windows 11 devices. [1][5]
Official Acknowledgement and Current Patch Status
Microsoft has publicly acknowledged that these residual Task Manager processes may degrade performance; however, no formal patch has been released as of early November 2025. Interim workarounds are recommended. [7]
Microsoft’s official KB documentation and update health pages have not yet provided a fix timeline. [6]
Verified User Workarounds and Best Practices
Before diving into specific solutions, it’s important to understand that the Task Manager duplication bug affects how Windows 11 handles the app’s closing mechanism after a recent update. Users should apply the recommended methods carefully to avoid worsening the issue and maintain system stability. These proven steps help in properly terminating duplicate Task Manager instances and preventing unnecessary resource drain.
Avoid Using the Close (X) Button on Task Manager
Do not close Task Manager using the “X” button to prevent orphaned processes. Use alternative shutdown methods below. [7]
Ending Task Manager Instances via Task Manager
Open Task Manager using Ctrl+Shift+Esc.
Under the “Processes” tab, locate all “Task Manager” (taskmgr.exe) processes.
Right-click each and select “End task” to terminate them properly. [4][3]
Command-Line Method to Terminate All Task Manager Instances
Open Command Prompt with administrative privileges.
Run the command:
taskkill /im taskmgr.exe /f
This forcibly closes all Task Manager processes in one step. [1]
Additional Remediation Steps
Restart your PC to clear any lingering Task Manager processes completely.
If KB5067036 has not been installed, delay its installation until a formal fix is available.
Monitor official Microsoft channels for updates and patch announcements regularly.
Identifying If Your Device Is Affected
Noticeable memory spike or system slowdowns after repeated use of Task Manager.
Multiple “Task Manager” entries listed under Background Processes in Task Manager.
Occasional increase in CPU usage associated with taskmgr.exe.
Glossary for Clarity
taskmgr.exe – The executable file for Task Manager.
End task – Action in Task Manager’s interface to terminate a process.
KB5067036 – The October 2025 Windows 11 preview update linked to this bug.
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